Plug - Lightweight OSX player for Hype Machine
NIGHT.FM - The cyberpunk-inspired radio station for netrunners
Poolsuite™ - The super-summer music player
Poolside FM - Experiment a radio made on Internet times.
Spotify - Map shows when two people play same song at same time
Playlist Hunt - Playlist Hunt is one of the best applications for Apple users to get the best music through it.