With the release of iTunes 4.0.1 music sharing over the internet has been blocked. For those of you who would like to continue music streaming I found this hack. I'm still searching for more and better ways around this problem so check back soon.
This website is dedicated to providing a way for people with iTunes 4 to share their music with others across the internet. Below is a list of IP address of people who are sharing their music you can connect to. To connect to someone who is sharing music, simply click on the Link. You may also add your own music to the site if you want.