I 403'ed "MicrosoftPrototypeCrawler" last week after it slammed my site and ignored my robots.txt exclusions. I assume they're still getting the bugs out at this point, but maybe I'll give the robot limited access just in case MSN goes live with this sooner than I expect.
P.S. I loved this new Windows feature mentioned in the article... >> A prototype application called "Stuff I've Seen," for instance, will store >> every screen that has popped up on a given computer monitor for a year.
That really really sounds like something I'd want to disable.