Animoto looks like it could be a fun resource to play with. Here's what they say about themselves.
"Animoto.com is a web application that creates MTV-style videos with the click of a button.
Users simply choose a song and images. Animoto then automatically generates a unique video for them. No two videos are ever the same.
Many of the post-production techniques that the founders used while working as producers for MTV, Comedy Central & ABC are used in Animoto's patent-pending Cinematic Artificial Intelligence developed to think like an actual editor and director. The resulting video is produced in a widescreen format, containing the visual energy of a music video and the emotional impact of a movie trailer."