Marshal Brain's How Stuff Works site and saw this link to some pages describing the basic concepts behind how digital cinema works. Star Wars AOTC is mentioned a few times and the article is quite interesting as it lifted the mystery on just what goes on to make a digital projection happen.

You can see from the list above that digital technology has already taken over a lot of the home entertainment market. It seems strange, then, that the vast majority of theatrical motion pictures are shot and distributed on celluloid film, just like they were more than a century ago. Of course, the technology has improved over the years, but it's still based on the same basic principles. The reason is simple: Up until recently, nothing could come close to the image quality of projected film.

But things are about to change: George Lucas is leading the digital cinema charge with "Star Wars: Episode II, the Attack of the Clones," the first big budget live action movie shot entirely on digital video. Most theaters will show 35-mm film transfers of the movie, but Lucas hopes his next digital picture, "Star Wars: Episode III," will play mainly on digital movie projectors. With more and more filmmakers embracing the new technology, digital cinema is well on its way.

In this edition of HowStuffWorks, we'll find out what digital cinema is all about, and we'll see what it means to the film industry. As it turns out, the rise of digital cinema will probably have a big effect on the world.

Thanks to Warren for the find!