I've been trying to figure this out, too. Just got phone yesterday and everything I've seen on web indicates there should be an "fm app" preinstalled, but there's not. And nothing in the market works. This phone is supposed to be able to act as an fm radio with a headset as the antenna, but most apps are for internet radio streaming and not for use as a tuner to access local stations. The one I tried didn't work, and the rest specifically say they don't work with this phone.
Ugh!
I called Sprint and the rep said he had no info on any fm radio capabilities.
I'm having a lot of issues with this supposed superphone.