MediaChest.com: “Borrow items from friends instead of renting; Meet new friends that like the same books, cds, dvds, and games that you like; Start building your own shared collection of media; Keep track of what you own; Make lists of stuff you want; Coordinate activities with friends.”
I remember reading something a while back about the affiliations that bind us: when you like someone, what it really means is that you like what they like. If you saw someone walking down the street wearing a tee shirt bearing the name of your favorite band, you’d probably like that person. Likewise if you saw someone on a bus reading a book by your favorite writer.