Here are a few of my favorite sites for making videos in the classroom:

Marco Torres's site on how to make movies. It is not updated frequently but explore older posts for some really good information.

Kevin Hodgson's stopmotion animation site for the classroom.

Jim Sill's Google4Video site on how to use free Google Tools to create movies from pre-producton t post-producton.

Vimeo Video School
free tutorials on moviemaking