Playlist Machinery - Tools that help you create & organize your Spotify playlists
Playmoss - Create playlists from YouTube, Vimeo and SoundCloud
Poolside FM for Mac - An infinity pool of summer sounds in your Mac menu bar
Audioship - Upload audio to YouTube or Facebook
Listen for Mac - Add songs to Spotify playlists using keyboard shortcuts
TunesToTube - What does TunesToTube do?