BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
Playmoss - Create playlists from YouTube, Vimeo and SoundCloud
20v - Create a custom music channel based on a single song
Playlist Machinery - Tools that help you create & organize your Spotify playlists
The Midi Shrine - A collection of MIDI files for SNES, NES, GameCube, Game Boy, and others.
Audioship - Upload audio to YouTube or Facebook