The combined credits of the three new bloggers below include DEXTER'S LAB, POWERPUFF GIRLS, FOSTER'S HOME FOR IMAGINARY FRIENDS and SAMURAI JACK. So you know to expect good stuff from these guys:
Don Shank (who also has a couple terrific paintings in the upcoming BLAST #9)
And here's a nice directory of animation artist blogs, courtesy of Smook. It's not by any means comprehensive, but it's the largest collection of animation blog links I've seen so far.