ShareMyPlaylists.com for iPhone lets you discover music through their impressive archive of playlists (they just passed the 20,000 mark!) On starting, the main tab lists the 10 featured playlists from the site, with large playlist cover art for each one. You can swipe through the playlists then tap the cover art for more detail or click the Play button to jump directly to Spotify and start listening.
The Latest tab lists all the recent playlists added to the site, while the Genre tab lets you browse any of SMP’s 24 genres. Search gives you the option to search by artist, track name, and playlist title.
You can’t add playlists via the iPhone app (there’s no login option), and there are a few features from the main site that aren’t here yet (playlist comments and star ratings for example), but this is a very handy app that integrates smoothly with both Spotify and the ShareMyPlaylists parent site.
A version optimized for iPad is imminent and hopefully an Android version is also in the works.