Cajun is a program that allows you to turn any computer into a massive audio jukebox for your car or home. It uses LCD displays/keypads, and supports infrared remote controls. Soundcard output is delivered to your (car or home) stereo for amplification. The software supports a playlist and shuffle mode.
Audio::Xmpcr is a Perl API to the XM PCR Satellite radio. It offers two different operating modes (direct and remote+daemon) via a single interface, continuous device polling for instant, accurate song listings, auto notification when songs change on any channel, and a few utility programs including a Web interface for remote control/listening to the radio via icecast, a stream ripper that divides songs up into properly-named wav files (for making MP3s), and a finder that searches channels for the song(s) wanted, and records just those.