I had this idea because I wanted to see the evolution of a web page while prototyping. Please let me know if you have suggestions or comments: https://github.com/johnlucas/gittimelapse
A sample video: https://www.dropbox.com/s/ktuiceg2yajtmld/video.mov
A sample video: https://www.dropbox.com/s/ktuiceg2yajtmld/video.mov