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