There's lots of new people clicking into the blog as a result of publicity and the release of Hellboy: Sword of Storms. If that's you, click onto the ARCHIVES there on the right and check out the start of the production blog. Tons of interesting stuff there and gives you even more of an insight into the process than the DVD extras.
Look for Hellboy: Blood and Iron on Cartoon Network in the middle of March and then out on DVD on May 8th. --Tad
The DVD release date has been moved to June 12 for more retail support. Meanwhile, catch it on Cartoon Network on March 17 if you can.