FrameByFrame is a freeware stop-motion app for OS X. I just used it to quickly make this very small test movie:
Here it is embedded. Click to play: Had to cut it b/c it was crashing people’s FF3.
The little bit of music here is from NIN’s new freely downloadable album, the slip. The entire album is licensed under a Creative Commons license that allows me to use it in this little test video. How friggin’ awesome is that?! The song is called 1,000,000.