Dave writes: "I got an email from a student at MIT with some very welcome news....'Once you've found the song in the database you can do all kinds of fun things. You have authentic artist, title, and copyright information. You can do collaborative filtering based on what people listen to and suggest other music the user might like. You can rip music automatically in bulk off the radio or stream servers. You can build realtime 'netplay' popularity charts based on what mp3's are playing all around the world *right now*.'" Interesting. More at tuneprint.com.