AppleInsider found four cooling-related patents by Apple that might be used in future MacBooks in order to better keep temperatures from getting absurd as performance increases. The most interesting is the one that uses USB/Firewire ports as vents.
File these under "new to me" category, but while I'd seen programmable thermostats before, I'd never encountered a vent that opened and closed on a timer.
The Light + Air door is designed to enhance cross ventilation without giving up any security or light. Slide a lever to the right, and the circular openings are exposed—not big enough for anyone to stick a hand in and open the door, but large enough to let the sunshine and fresh air pass through.