Phillip Burgess of Adafruit has used the to build a Raspberry Pi radio that can play Pandora streaming over Wi-Fi:
Raspberry Pi, the little wonder-puter that’s taken the world by storm, is so affordable that we can create nifty single-purpose “appliances” around them without shame. Here’s our take on one of the more popular such applications: internet streaming media, the Pandora music service specifically.
With the addition of a small LCD, a few buttons and a USB wireless network adapter, the Raspberry Pi becomes an affordable self-contained music streamer that can be moved to any room of the house…wherever you need your tunes at the moment. Just connect power and speakers or headphones.
Here's a video: