I never noticed anything like this before:
66.249.72.1 - - [08/Jun/2006:22:08:53 -0400] "GET /cgi-bin/rbltqm?ip=66.
249.65.134
HTTP/1.1" 200 571 "-" "Mozilla/5.0 (compatible; Googlebot/2.1;
+http://www.google.com/bot.html)"
The bot is checking the DNSBL status of another bot IP.
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Displayed Email Address is a SPAM TRAP
Our DNSRBL - Eliminate Spam: http://www.TQMcube.com
Multi-RBL Check: http://www.TQMcube.com/rblcheck.php
The Dirty Dozen Spammiest Ranges: http://tqmcube.com/dirty12.php