FIEND.fm - "Hot or Not" for music discovery: 2 hrs of tracks in 2 mins
Bowtie - Bowtie is a desktop accessory that allows you to see and control your music (iTunes, Spotify...
Pacemaker - Create and share mixtapes with friends
CoverSutra - CoverSutra gives you a handy and attractive way to control iTunes without ever leaving your current...
Boil the Frog - Create a seamless playlist between any two artists
Muzzy - it’s a tiny and gorgeous iTunes companion that lives on your menu bar. For Mac OSX, its free!