Since I can never pass up a bandwagon, I, too, have included my writing up for bid in help_haiti. Basically, comment saying how much you're willing to donate to World Vision.Org, starting at $25 and going up by increments. The highest bidder will get a story of at least 10,000 words, penned by me and written to your specifications (Fandom, pairing, rating, if you want it to be a sad/happy story, etc!). I will complete the story within two weeks.
My thread is here. Even if you don't want to participate in the auction, please donate some of your money or time.