Star Wars Begins by Jamie Benning - http://vimeo.com/32442801
This guy has compiled commentary and BTS clips and combined them with the film. He also has done the same things for Empire and Jedi. I'm sure it has been discussed before, but I didn't see it in this forum. A while ago he even re-uploaded it in HD. A great find if you enjoy rewatching the films, but then again... if you didn't why would you be here?