The Darth Side: Memoirs of a Monster has been passed around the Internet for a while now. It's a brilliant retelling of Star Wars IV-VI from Darth Vader's point of view, complete with Livejournal-style moods and running asphyxiation jokes. The author has collected it now into a single file, so you can read it chronologically. I don't say this for a lot of fan-fiction, but I really recommend it. At this point, the elder Star Wars trilogy has become a cultural artifact, ripe for adaptation. The Darth Side is Rozencrantz and Guildenstern Are Dead to its Hamlet.