Check out this interesting essay from Loni Peristere of Zoic Studios; about working with Joss Whedon and the importance of storytelling in visual effects.
I was lucky enough to spend two weeks work experience with Loni and the team at Zoic in 2002. They were primarily working on Firefly, Angel and the final season of Buffy at the time. I learned so much about tv production from them and I will forever be thankful for that experience.