i love my air - love the size, the design, the screen, that it lacks a useless optical drive. yeah the battery is weak. and yeah, the HD is limited. but i feel like the poor performance -- way below what was advertised -- may be my pushing point. just curious if anyone else is getting really curious about switching to one of these new macbooks. people keep on throwing around the words "aluminum case" and "really thin." i'd be willing to lose a couple of hundred of bucks when ebaying my air to trade down if they get the macbook to the low 4 lb / high 3 lb range.