I was in a shop that had a MacBook on display along with a 15" MBP. I tried pressing F9 on both of them to see the exposé effect where all the open windows are next to each other. To my surprise, the effect was a bit laggy on the white macbook! The MBP did it smoothly, just like my pbook. Maybe it was because the open apps were a bit heavy. But they were just maybe 4 iLife apps running idly, and the CPU's are dualcore. Only 512MB RAM, in both machines but shouldn't expose still be smooth? Even my previous 800Mhz iBook G4 was pretty smooth with exposé when you had less than ~10 apps open as far as I remember. How are your experiences with the macbooks graphics capabilities?