Lifehacker has a great guide to using a program called DVD Flick. This free, open-source, Windows-only program allows even novice users to burn videos in a range of formats (DivX, MPG, etc.) to playable DVD.
This is a great solution for a variety of situations. For example, some schools are limited to a projector per department, so a teacher would be able to use DVD Flick to write a DVD of some downloaded/shared video file and show it via an inexpensive DVD player hooked up to an existing TV.
I do think that digital video is the way forward, but we need tools such as this for interim stop-gap times when we’ve got no other choice because the hardware just isn’t there. This is certainly one to spread the word about!