livelongnmarry is a fandom auction to support marriage equality in California. Bidding opens tonight (specifically, at 12:01 a.m. Pacific time on July 1), and there are lots of very cool things up for auction—fanfic and fanart, of course, but also music composition, poetry, baked goods, knitted goods, jewelry, autographed books, writing critiques, language lessons, translations . . . Check it out.
(And if you're not interested in bidding on anything but would like to support marriage equality, there are links in the userinfo to organizations you might be able to help.)