Pandora is a very cool website and it's very easy to use. Sign up and it's free for life with ad's. Once registered,put in the name of your favorite band or artist and it'll play a song by them. You rate it either good or bad. Based on what you rate every song (and you have to rate every song otherwise there's no point in having it), it'll play things suitable to your taste. You can also add new artists that you like and the program changes to your taste. You can have up to 100 seperate "stations" to suit your taste as well, so you don't neccessarily have to have all of your favorites in one station.
http://www.pandora.com/?sc=sh185698That's my station if you're curious to listen in. If you have one, post a link to yours as well. To do so, email yourself a referal and it'll send you a link.