Openwhyd - Collect and Share the tracks you love.
Zoff - Collaborate on a live music and video playlist with your friends.
musiqpad - Musiqpad is a social-music software platform for users to host their own ‘pads’ (rooms).
SoundClick - SoundClick is a music-based social community.
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
FoxTube - Play YouTube video continuously with playlists. FoxTube features: