A friend of mine just got me onto Pandora.com. You create a free account (very quick and easy), search a song, artist or album and it starts playing that artist and similar artists. You thumb up what you like and thumb down any odd cruddy ones. It saves your preferences as you go along. It's a great way to discover (or rediscover) music!
Yesterday while installing software and troubleshooting weird issues in one of the computer labs where I work I got through stuff like Van Morrison, Steve Miller Band, Rush, Porcupine Tree... Loved it!