FIEND.fm - "Hot or Not" for music discovery: 2 hrs of tracks in 2 mins
The Wub Machine - Turn any music into Dubstep, Drum & Bass, and more.
Pacemaker - Create and share mixtapes with friends
The Eternal Jukebox - For when your favorite song just isn't long enough
Boil the Frog - Create a seamless playlist between any two artists
YOU.DJ - Mix SoundCloud music and Youtube videos live in your browser.