Scrapbox - A new style of note-taking that lets you create, discuss, and learn together in one self-organizing space.
Magic Playlist - Get the playlist of your dreams based on a song
Facebook Scrapbook - Organize Photos of Your Child on Facebook
Spotalike - Spotify playlist with similar songs, according to Last.fm
Baby Snap - Capture one second of your baby every day
Playlist Machinery - Tools that help you create & organize your Spotify playlists