http://Animoto.com/education, is fantastic for creating all types of wonderful videos with a plethora of themes. It's as simple as uploading pictures/images & sorting them, choosing a theme, choosing music, and pushing a button! Animoto takes care of the rest. Within a few minutes, the video is finished and ready to download or share.
Last month, I had my 2nd grade illustrate the parts of the Lifecycle of a Butterfly in MS Paint. I saved the drawings as jpg files and uploaded them to Animoto. We picked a theme (sky and clouds) and a song "Elusive Butterfly" by Geoff Byrd - and let Animoto do its magic. The students, teachers, and parents were thrilled.