(...)
I also got a little peak at one of the m10 Mobility Radeon 9600 chips, which was in a desktop AGP package that let them test the chip in a normal desktop computer as if it were a normal r3xx chip. As you can see in the picture (above), it only needs a small passive heatsink to stay cool, which is important for mobility chips for reasons of power consumption and weight (who would want a big heavy heatsink with a battery-draining fan on it in their laptop?).
Read over here: http://www.driverheaven.net/insideati2/
Edit: fixed link