Check out the Free version of Party Playlist HD. The only thing it doesn't do that the full version does is save / open your playlists. This is a great app for playing and queueing up music when friends are over. Airplay support coming soon.
http://itunes.apple.com/us/app/party-playlist-hd-lite/id401272383?mt=8
http://itunes.apple.com/us/app/party-playlist-hd-lite/id401272383?mt=8