When you're listening to your music, Equilibrium gives you controls that work with iTunes, Spotify, Rdio, and Vox.
The UE Smart Radio is a capable music streamer with access to both your local tunes and all the online services you could want. The rechargeable battery makes the compact unit even more portable. What holds the Smart Radio back from being a better product is the flaky desktop and mobile software.
Apple's Ping may have been a failure, but there are some good ways to share your musical tastes with friends and expand your horizons at the same time.