I just released Number8 (www.numbereight.me) to the iOS app store - it auto-curates music playlists by using the sensors present in our smartphone. As we go about our day, new playlists appear (waking up, commuting, working out, chillin' etc.) on the main 'Discover' tab of the application thereby making our music discovery process contextual and super easy. The goal of the application is to expand the user's music horizon by harnessing the power of sensors present in our smartphones and not relying solely on our past listening behavior as most other music applications. You can follow us on Twitter @ https://twitter.com/1_number_8 or Facebook @ https://www.facebook.com/implicitunes/.
On a side note, the application was a culmination of my Master's thesis and I currently use it for all of my music discovery - would love to get some feedback!