Ok, this is not Vim related, but it is something I'm very excited about. Here at Grooveshark, the startup company I work at, we've just launched a new service. It's called Twisten (a play on tweet + listen), and it uses the Twitter API to aggregate tweets about music. For any song it can identify, it adds the tweet to a public timeline and allows you to play the song.
My primary role on the team was designing the parsers which identify meaningful bits of information inside a tweet and then converting them to actual songs. Fun stuff!
If you're a fan of Twitter (or music), check out Twisten.FM.