We still specifically ALLOW the Ask Teoma bot for nostalgic reasons, and they haven't stopped crawling our site, but look at this weird UA, which got a speedy 403 of course...
204.236.147.79 - - [23/Nov/2010:15:30:56 -0500] "GET /robots.txt HTTP/1.0" 403 294 "-" "\"Mozilla/2.0 (compatible; Ask Jeeves/Teoma; +http://about.ask.com/en/docs/about/webmasters.shtml)\""
They visited using that format and IP.
Same day they used this format and got in:
66.235.124.15 - - [23/Nov/2010:03:30:47 -0500] "GET /robots.txt HTTP/1.1" 200 1221 "-" "Mozilla/5.0 (compatible; Ask Jeeves/Teoma; +http://about.ask.com/en/docs/about/webmasters.shtml)"
Deliberate, ham-fisted, or desperate?