Playlist Hunt - Playlist Hunt is one of the best applications for Apple users to get the best music through it.
TubeLister - Generate a YouTube playlist from your opened tabs.
Book Playlist - Collaborative music playlists for your favorite books
OrganizeTube - Create video playlists from Youtube, Vimeo and other sources
Musicon - An interactive music-making machine for children
Vidlis - Create music playlists from YouTube videos.