If you noticed with the new 3G iphones, the power supply has shrunk to just a plug. I never understood why the power supply for my first gen iphone was so huge... My Macbook Pro has a HUGE brick power supply which I have to lug around... If they managed to create a much smaller, thinner power supply for the macbook, the overall weight for laptop and power brick would be reduced, easier to carry, and fit into a thin laptop case...
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To me this is the real answer. "Brick" has always referred to the power supply for your device, whether notebook, printer, router, you name it. If they have found a way to integrate the electronics between an "in the case" component and a smaller "wall wort" size plug, they will really cut down on travel issues with the notebook. I get REALLY tired of wrapping up and finding a place for the brick because I'll know I run our of power at the other end of the trip.
Or let's get even MORE CREATIVE - same size "Brick" but it is also a Li-Ion supplemental battery for an extra couple of hours of power on the road - does more than just take up room in the carry-on! You heard the idea here first - so if Stevie hasn't managed to think this one up yet - I claim it.