This was mentioned in the comments section of a metatalk thread about Listening Room, but our very own Narwhal Bacon has released the source for a (far superior, imo) clone of it called Collaborative Jukebox. There is a room open right now for mefites at MixParty.org [more inside]
In Projects -- The popular links for "March" include projects from March '06.
I guess the Metafilter writer's group is dead? I don't see any updates from the past two months.