
Knowing I was in to my music a friend of mine at work recommended
Last.fm to me. There's a lengthy description on
Wikipedia so I won't try and explain it all except to say that you listen to music, the site logs it and then recommends other bands to you.
You can listen to the stuff it recommends more-or-less like an internet radio station.
They also have groups (like forums) and each of those have a radio station as well. So basically, lots of music to listen to.
You can
view my profile or my
charts.