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So, I was thinking about why Apple did not release 12" and 17" Powerbook replacements. I'm beginning to think that, instead of just having different sizes, the unreleased MacBooks could have vastly different functionality.

They could make the 12" a convertible tablet with special features for road warriors.

They could give the 17" a TV tuner, a blu-ray disk drive, and perhaps an HDMI/DVI connection for HDTV, making it the ultimate portable AV studio and DVR.

(Analog TV should be gone by 2009.)