Here is a short documentary (about 15 minutes) on Production IG! It's very interesting to see how they work (especially on Ghost Hound and Seirei No Moribito).
Enjoy
http://www.animenewsnetwork.com/ann-tv/2008-03-15
Production IG documentary
Moderator: sonic
Production IG documentary
Why drink and drive when you can smoke and fly ?