IronMic - The easiest way to create a website for your podcast
Magic Playlist - Get the playlist of your dreams based on a song
Podpage - Build a podcast website in less than 5 minutes.
Spotalike - Spotify playlist with similar songs, according to Last.fm
Podsites - A fast, beautiful, professional website for any podcast
Playlist Machinery - Tools that help you create & organize your Spotify playlists