Traffic broken down by application protocol?

I'm looking for statistics on the composition of Internet backbone traffic broken down by application protocol. Ideally, I'd be interested in a list showing the relative percentage of packets by TCP and UDP destination port of some large sample of Internet traffic. But I'll take any statistics related to application protocol traffic distribution that I can get. If anyone has information that they would be willing to share publicly or privately, I would be grateful for it. Alternately, if anyone is aware of such information publicly available, I would be grateful for pointers to that, too. Thanks, Matt Larson