About two months ago there was a post about apple filing a patent for having a notebook slide into the inside of an iMac . . . the MBA would be a perfect candidate for such a combination, no? This would turn the iMac into the dock for the Air . . .
I do like that, but think it may be more suitable to dock with a tower. The tower could hold additional optical drives, hard drives, and have PCIe cards.
The alternative would be something similar to docking with an iMac, but instead use the screen on the *Book.