216.139.221.108 - - [28/Apr/2006:07:38:03 -0600] "GET /robots.txt HTTP/1.0" 200 4695 "-" "KakleBot - www.kakle.com/0.1 (KakleBot - www.kakle.com; http:// www.kakle.com/bot.html; support@kakle.com)"
Seems to be some PPC engine, not sure why they crawled - perhaps not geting enough paying customers :)