Twinjack - Stream Spotify music with anyone with just a link
Poolside FM - Experiment a radio made on Internet times.
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
Noted - Social music discovery
ReverbNation Discover - Stream hand-picked, ad free music from emerging artists.
Poolsuite™ - The super-summer music player