If you've yet to check out the first OVA for Ghost in the Shell: Arise then I highly suggest you drop what you're doing and get to watching. The animation for the four-part OVA is by far the best the series has ever provided, and the fresh take on Motoko Kusanagi's early life is perfect.
To celebrate the upcoming second part of the series, this short making of video was put together. While not as informative in terms of their inner-workings, it gives some great insight on the studio's animation process. The entire video is rather mesmerizing and helps build the hype for future entries, November 30th can't get here any quicker.