Star Wars enthusiast Jambe Davdar has created a three-part “expanded commentary” for the original trilogy. He has re-cut the original movies, stitching in audio from cast, crew, etc. interviews, Pop-Up-Video-style text commentary, behind the scenes footage, deleted scenes and more. His cuts, Star Wars Begins, Building Empire, and Returning To Jedi, are available in 61 parts on YouTube. Metafilter has the links (along with a discussion).
To give you an idea, here’s the fourth section of Building Empire:
How great is the cut to the Marvel comic? I’m enthralled because this is Star Wars, of course, but also by the original mesh of documentary and commentary track. This is the first time I’ve seen anything in this form: essentially, a making-of documentary woven into context. I expect the studios will give this kind of commentary a go, too. If they hustle, Lucasfilm could bang out their own version for the Blu-Ray release.
Explaining bonus: Mr. Davdar has a blog with some information on how he made his making of.