Playlist Machinery - Tools that help you create & organize your Spotify playlists
Magic Playlist - Get the playlist of your dreams based on a song
Playmoss - Create playlists from YouTube, Vimeo and SoundCloud
podsync - Simple and free service that lets you listen to any YouTube or Vimeo channels, playlists or user videos in podcast format
Spotify.me - Beautiful analytics on your Spotify listening habits 🎧
Audioship - Upload audio to YouTube or Facebook