I'm a little slow on the uptake - Brian and Jesse have been talking about this site called Pandora for weeks. It's based on the Genome Music Project. Basically, it's an online radio station that plays the music you choose and suggests new music based on what you like. I have a Tori Amos Station, a Weezer station, and a Dresden Dolls station, and, I must say, they're all very good. Try it out if you're looking for a simple way to find new music.