Kineska links to a neat thread on the AniPages forum where Peter Chung (of Aeon Flux and Animatrix fame) offers some very interesting details and perspectives from his experiences. I'm only half way through the thread myself, but I'll be finishing up the thread when I get time. I was probably a tween the last time I was actually interested in animation theory and process, though Makoto Shinkai's work has inspired me to look into it more in the past couple of years.

Check out the thread from the start.