One of the key books regarding nanotechnology is now online, for free. And also, Eric Drexler's site is worth checking. As well as this one.
It will still take a couple of decades for this technology to be available for making truly gravity-defying architecture, for example. Or truly smart architecture. Or...
Let's hope the trend of crucial books being made available by their authors continues.
(There was already John Frazer's, as well as S. Wolfram's A new kind of science, and certainly more that I don't remember right now)