The N800's small. Revo-sized small.

But it's still too big to carry around everywhere: I live in a country which has a bit of a summer, no room for an N800 when just wearing a t-shirt and shorts. And it's not got the necessary oomph to be more than a nice video player and a device for quick checking of Google/Wikipedia/email/maps on the move (which my phone can do too, adequately).

But anyway, your dream of a micro-computer (literally) which can be used as a desktop/laptop/UMPC/tablet is one I share. It's also the use case of the OQO.