I didn't know that you can listen to audio/radio feeds through itunes...it's pretty cool.
Here are some stations that I like that I found through the website live365
A Fistful of Soundtracks - Assorted Fistful: Music from movies and TV, in shuffle mode.
Muppet Central Radio
ThemeSongChannel.com - TV theme songs from the '50s til today -- everyday is different!!
Radio is a pretty good way to find songs that you might like. I wish I had an ipod touch so I could use this app