Thanks BW. I had glanced through some of the other support threads before posting, but I didn't realize that the game still works fine in fullscreen after the launch menu. I only tried it in windowed, and assumed that my 8600M was more severely affected than other cards. Fullscreen only is good enough until you have time to re-compile.
I keep hearing how 10.6.4 is going to have lots of graphics driver changes (maybe Starcraft 2 will finally have acceptable performance on mac?), so hopefully no updates to Book 1/2 will be required when its released.