How do I block streaming media on a Cisco 2811 Router?

Ok, so I took over a small network, with very limited bandwidth. Streaming media of any kind, except for Skype, devastates the network.

How do I block all streaming completely? So far, I researched, and setup the router to drop RTSP (Real Time Streaming Protocol) packets, but I can still stream media from a couple sites. Vimeo.com is an example.

I read that there are other protocols for streaming as well… PNM, MMS, and others, but the router would not accept those inputs. Would only recognize RTSP. So how do I block the rest?

Again, it’s a Cisco 2800 Series Router. Thanks.