Spotify DJ allows you to  broadcast live DJ sets to other Spotify users from your PC or Mac. The free desktop app requires Adobe Air to run and once installed everything runs seamlessly. Features  include Twitter posting and Last.fm scrobbling.

Your live broadcasts are accessible via an 0nline DJ address that will look similar to mine: http://spotifydj.com/dj/daveholmes

Playing the channel launches the Spotify app on the listeners computer. Your online presence is automatically announced via the tweetstream at http://twitter.com/spotifydj

For people using the software there’s also a Spotify DJ Facebook Group and here’s the back story for the app

Via Jazzper The first AIR app for Spotify is a DJ app - AWSOMENESS!