Looking for non-fiction video?
Search your Tumblebook collection to find selected video clips on a range of non-fiction topics. You can get the URL by choosing "Show Toolbar" once the movie loads. Most clips are quite short, but would make a nice intro to a topic in class.
The iPad version of the picture books are also short videos. When you first visit the TB site, choose "Mobile" from the upper right and hit go. Then you'll get all the iPad-ready (movies) books that you could project and "play".