Discovering New Music

So here’s a question. When I talk to people who are under 30 years of age most of them do not listen to the radio. So that leads me to a question for all of you: How do you discover new music?
We used to hear something new or different on the radio and then go and buy the CD to listen to more. Today there is radio, tv, myspace, facebook and friends, but how do you find new music? Please reply to this post or send me an email. I’d appreciate it.