Animoto
http://animoto.com/
http://animoto.com/education
Provides an array of tools for creating videos


JayCut
http://jaycut.com/

Import photos, audio, video, and make a movie on a multi-track timeline plus transitions and effects

Xtranormal
http://www.xtranormal.com/

This tool provides you al of the tools a movie director would have to select a set, actor sound effects, etc and create a movie made from only the dialogue text you type into the tool.

Shwup
http://www.shwup.com/

Upload media (images and movies) or load from picassa any web pages, even form an email message into an "album". From an album, create a slideshow or a "muviee" using a small selection of themes and music.