They include Spore Creature Creator on all the Macbooks in the store so you can test the graphics. I ran it for a few minutes and I'm very impressed. The new Macbook is great, I'm definitely going to get one.
Edit: I've found what some people might consider to be a fatal flaw. There is quite a noticeable amount of blur when things move on the screen. It's not so bad when it's slow, but if you're doing something like dragging a window quickly, it's pretty noticeable. When I dragged a window around pretty fast, icons in that window blurred a noticeable amount. This won't keep me from getting one, but it is kind of annoying.