Did you ever felt the urge to stream music to your iPhone? Me not, but anyway the fact that this is possible now is already cool. Enter Airfloat, the open scource Github Cydia application makes this now possible. And even better it is free. The application has been removed from the App Store and is now available again via Cydia.
Turn your iPhone into an AirPlay audio receiver, send audio form iTunes, iPhones, iPads or Apple TVs to your iPhone, just as if it was an Airport Express.