yeah, nanotechnology is pretty much what has been said.
it's most important aspect has to do with interconnects for extremely small circuits.
go to eetimes.com, you'll find some important information.
as for quantum computers, the most important thing is to increase the qubit capacity of current computers as well as to make the coherence last longer. i mean, interconnects mean squat if there is nothing to connect it to.
i read about silicon nanowires, and they were quite an interesting read =)