Working With The Bandwidth Problem?

macdaddy asks: "Being a Network Admin in a small university, I have to fight the Napster issue every day. I don't want to ban it but we only have 1 T1 and it maxes out around 10AM when the dormites wake up, and finally teeters off around 4AM when they go to bed. That really hinders legitimate use. My question, how does a Netadmin work with Napster and its users to keep from blocking it while still being able to use out lowly T1 for other purposes? What options are there? Proxies? Firewalls? Traffic shapers?" This problem is not just about Napster. There will be other services that, due to their popularity, will stress your network's bandwidth to the limit. It seems to me that establishing network controls would be more fair than completely filtering out the entire service, so what's the best way to implement them?