I've got a Windows Small Business Server 2003 domain and need to block access to web radio streams. How can I accomplish this without purchasing specialized software?

Thank you!

Could setup a GPO /logon script to download a hosts file that you setup yourself that points 127.0.0.1 to the urls or IPs of these streaming radio sites. Just make a list of them on the server and you should be good to go.

Surprised there's no proxy.