What I'm waiting for (and maybe I'll get it when Windows 7 comes out) is a netbook with an Atom 300 series, or any dual-core chip for that matter. It's not like I want to play Crysis on one, but a little more omf would be really nice. As of right now, they all seem to have more or less the same CPU, whether it's a N270 or N280 or Z something, they are all about the same.
I would be impressed with a 200 MPG car, let alone an aircraft. It would need to have an incredible lift to drag ratio. Still, I like the idea of the thing being worked on.
I think that with the moon's lower gravity you could get away with hauling much more weight in batteries.