Cellular Macbooks
While I agree with Marco that only some minor changes would be needed to prepare OS X for cellular connections, the only way it would be of interest to me is if they were able to deliver a carrier-neutral device. Locking a substantial capital purchase like a decently configured Macbook Air or Pro to a single carrier just seems incredibly silly and shortsighted to me.
Phones, Tablets and netbooks are all acceptable risks in my eyes, but once you pass the $1000 mark, the idiocy of the carriers’ decisions in just the past year comes into sharp focus.