FIEND.fm - "Hot or Not" for music discovery: 2 hrs of tracks in 2 mins
SoundMate - Enjoy SoundCloud from your Mac's menu bar
Pacemaker - Create and share mixtapes with friends
Tangerine - A beautiful full-screen SoundCloud player
Boil the Frog - Create a seamless playlist between any two artists
NOISESUPPLY - Pandora for SoundCloud