You've probably seen this already, because it's been cross-posted to many blogs; but in case not: "Do the Write Thing For Nashville" is an online fund-raising effort that is auctioning off signed books, critiques, and other literary goodies to raise money for Nashville flood relief.
New items are listed daily. If you're a reader or a writer, you'll probably find several things of interest. You bid by simply posting your bid in the comments.
Disclosure: One of the upcoming lots is donated by yours truly. (But Mom and Dad, don't bid on it! :)