Go to: http://search.twitter.com/search?q=%23queryfail.
My favorite example so far comes from ReneeAtShens:
"P.S. I collect stamps. Should you have any stamp...that is destined for the trash can, [please] stuff them in the enclosed SASE" #queryfail
Follow-up to QueryFail:
Amazing amount of brouhaha about queryfail. IMHO, the purpose was not to mock writers, but to teach us what not to do in writing a query. For a nice collection of links to articles about how to write great queries and avoid #queryfail, check out this Chico Writer's Group blog post http://ejourn.net/cwg/2009/03/06/how-not-to-be-targeted-by-the-evil-queryfail/.