I think you're asking for something a lot of us have wished for. Some comprehensive list of things people shouldn't be using that aren't necessarily viral or sometimes have a legitimate purpose. Deciding what should and shouldn't be blocked varies so much between organizations, however, that there is little hope of it being a one-stop shop, but more of a guideline. For example, at my university, Skype and Bittorrent are heavily used for legitimate purposes, but at your typical office building, they're a huge risk.
Keep in mind, NTP can block a lot of P2P traffic without careing about the program that is generating the traffic.