There appears to be an endless amount of confusion regarding Mac OS X (Jaguar) and Quartz Extreme acceleration. According to Apple, a "supported" video card is the following: *nVidia: GeForce2MX, GeForce3, GeForce4 Ti, GeForce4 or GeForce4MX. ATI: any AGP Radeon card. Then, they make this recommendation: 32MB VRAM recommended for optimum performance. In confirmation is this xlr8yourmac thread in which an ATI employee notes that Quartz Extreme will work with 16mb. Bottom line: the new iBooks will be able to take advantage of Quartz Extreme.