keyplyr - 11:47 am on Feb 11, 2013 (gmt 0)
For over a year Bingbot has doing a full crawl of my 260 page site each and every day, usually twice, sometimes more. It requests robots.txt at least 100x per day.
Bingbot also sometimes injects a nonexistent directory into valid file paths rendering them non-valid, so out of the roughly 500 or 600 page requests per day, it generate about 200 404s. I have had numerous conversations with their techs via email. More than once they have promised this behavior would eventually correct itself. It has not.
However I'm reluctant to push the matter since I have been steadily gaining SERP placement over the last year, so much so that I get a very nice amount of traffic from Bing now. That's a good thing since I lost a tad in Google with the second wave of Panda.