The social music discovery service Rdio has gotten an iPhone facelift; the company's app has a bunch of new features in version 1.0 (released today), including a key improvement for users who sync their music from Rdio down to their phones for offline access.
Much like Apple's Ping social layer for iTunes, Rdio gives music recommendations and listings based on what your friends like to listen to -- but it also gives you direct access to the music, letting you play it on the company's website or on your mobile device.
Beyond the UI improvements in the new build (including a handy springboard for quick access to all the sections, and a persistent player at the bottom of the scree
