This page tests an experimental robots.txt directive:
"Index: /repstuff/index-nofollow.php
Nofollow: /repstuff/index-nofollow.php"
for the page linking here

Below is a list of search engine crawlers from Google, Yahoo, MSN and Ask which requested it. The working theory is, that all crawlers except Ms. Googlebot ignore the robots.txt statement above. Whether the possibly crawled page /repstuff/index-nofollow.php linking here passed the indexer or not can be checked by requesting Google's cache of the referring page. Whether this page made it in the search index via the link on /repstuff/index-nofollow.php or not reveals this link to Google's cached copy of this page. Perhaps all this leads to nothing but fun. We'll see. Here is the log file:

IP Address TimeStamp Response UserAgent Requested URI
Faked 2007-11-21 00:00:01 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
Faked 2007-11-21 00:00:01 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
Faked 2007-11-21 00:00:01 200-OK Mozilla/2.0 (compatible; Ask Jeeves/Teoma; +http://sp.ask.com/docs/about/tech_crawling.html) /repstuff/index-nofollow-linked.php
Faked 2007-11-21 00:00:01 200-OK msnbot/1.0 (+http://search.msn.com/msnbot.htm) /repstuff/index-nofollow-linked.php
Faked 2007-11-21 00:00:01 200-OK Googlebot/2.1 (+http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
66.249.72.209 2007-11-21 14:56:58 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
74.6.27.100 2007-11-28 21:54:49 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.100 2007-12-06 18:03:42 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
66.249.72.209 2007-12-07 06:21:10 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
74.6.27.100 2007-12-13 18:06:23 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.100 2007-12-20 18:07:23 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.100 2007-12-27 18:07:48 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-01-04 00:09:04 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-01-11 00:14:00 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-01-18 00:36:00 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
66.249.72.5 2008-01-24 08:12:21 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-01-25 00:37:24 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
65.55.209.149 2008-01-28 06:32:50 200-OK msnbot/1.0 (+http://search.msn.com/msnbot.htm) /repstuff/index-nofollow-linked.php
66.249.72.5 2008-01-29 19:26:10 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
65.55.209.149 2008-01-31 12:24:16 200-OK msnbot/1.0 (+http://search.msn.com/msnbot.htm) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-02-01 12:11:46 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
65.55.209.149 2008-02-03 05:32:37 200-OK msnbot/1.0 (+http://search.msn.com/msnbot.htm) /repstuff/index-nofollow-linked.php
65.55.209.149 2008-02-06 09:34:35 200-OK msnbot/1.0 (+http://search.msn.com/msnbot.htm) /repstuff/index-nofollow-linked.php
66.249.72.5 2008-02-07 06:51:31 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-02-08 12:19:21 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
66.249.72.5 2008-02-13 08:48:35 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
66.249.72.5 2008-02-14 20:33:25 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-02-15 12:21:02 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-02-22 20:38:24 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
66.249.72.74 2008-02-25 23:04:46 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-02-29 20:57:10 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
66.249.72.74 2008-03-03 10:39:49 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
65.55.209.149 2008-03-05 04:20:17 200-OK msnbot/1.1 (+http://search.msn.com/msnbot.htm) /repstuff/index-nofollow-linked.php
66.249.66.239 2008-03-11 12:20:20 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-03-12 00:31:15 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-03-13 01:29:03 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-03-15 07:18:07 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-03-18 08:19:56 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
65.55.209.149 2008-03-22 16:56:07 200-OK msnbot/1.1 (+http://search.msn.com/msnbot.htm) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-03-23 09:45:37 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
66.249.66.236 2008-03-28 08:04:00 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-03-30 09:47:30 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
67.195.51.152 2008-04-04 22:20:37 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
66.249.66.44 2008-04-05 05:19:57 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-04-07 04:58:40 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-04-08 06:43:00 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
65.55.209.149 2008-04-08 21:27:58 200-OK msnbot/1.1 (+http://search.msn.com/msnbot.htm) /repstuff/index-nofollow-linked.php
67.195.51.152 2008-04-12 05:29:32 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
66.249.66.44 2008-04-14 00:50:20 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
74.6.27.100 2008-04-15 06:51:36 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
67.195.37.91 2008-04-15 13:25:13 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp/3.0; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
67.195.51.152 2008-04-19 05:32:21 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.121 2008-04-20 12:15:25 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.121 2008-04-21 16:11:38 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
66.249.67.234 2008-04-25 03:01:54 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
67.195.51.152 2008-04-26 05:34:44 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
67.195.37.91 2008-05-03 05:28:13 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp/3.0; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
67.195.51.152 2008-05-03 10:21:29 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.121 2008-05-05 19:08:19 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
66.249.70.170 2008-05-08 01:52:39 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
67.195.37.115 2008-05-10 05:28:49 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp/3.0; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.121 2008-05-10 10:21:32 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
66.249.67.165 2008-05-10 17:37:55 200-OK Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) /repstuff/index-nofollow-linked.php
67.195.51.152 2008-05-12 07:12:24 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
74.6.27.121 2008-05-14 19:52:26 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php
65.55.212.242 2008-05-15 05:32:54 200-OK msnbot-media/1.0 (+http://search.msn.com/msnbot.htm) /repstuff/index-nofollow-linked.php
67.195.37.105 2008-05-17 05:33:59 200-OK Mozilla/5.0 (compatible; Yahoo! Slurp/3.0; http://help.yahoo.com/help/us/ysearch/slurp) /repstuff/index-nofollow-linked.php

The first five entries are samples. An empty table wouldn't look nice.