Not coincidentally, he mentioned many of these in the Animated Panel that he was a part of with Marty Isenberg, and Matt Youngberg at Botcon 2008.
You can see the BLOG titled, "A Delightful Tedium" here.

You can keep up with all the latest Animated talk in the Official Animated Discussion Thread and any Animated news, as well.
Can you guess who the nine characters are in the piece of art?