Media Streaming for Dummies?

Jon writes "Back in grade school, one of the things I helped the school set up/run was a in-school broadcasting system based on a few simple switches that went between a HyperCard stack with cool animations and the kids that would tell the news for the day. It's a great way to get kids involved in school, and my mother who is now a principal at another school is wanting to get something similar set up again. However, they don't have cable outlets in all the classrooms, and so I've been pondering streaming the content over their network. All the rooms are running Mac OS X. So, I turn here to Slashdot to ask, if you had 26 classrooms how would you approach the problem of getting video to them in an inexpensive way?"