I really didn't care at all about having access to the making of documentary videos when I signed up as a supporter for Doublefine's Adventure game, but I just watched the latest video by 2 Player Productions, and have to say that it is excellent. The video's about 25 minutes long, mostly profiling the team members and then following them on a bar crawl. (DF games all have codenames based on Chinatown bars).
Signing up as a supporter is well worth it. You can watch the documentary videos and look at concept art. Scott C's one of the artists working on the game now.