Drop a movie on xbMovieMaker.app and let it work. A few seconds later you should have a screen saver with the same name as the movie you used (it will end with .saver).
You can use any kind of movie. As long a quicktime recognized it. This includes:
- Quicktime movies.
- Flash animation (with Quicktime 6).
- DIVX\'s and AVI\'s (with the right codec).