A while ago I wrote a review of Spiritual Machines for some website:
warning, it's negative.
It seems to me that Kurzweil's prediction of the future is too detailed, too specific, and too confident.
He's like, here's how it's going to go down: boom boom boom. Apparently, it's going to be unimaginable, but he's able to describe with certainty that it will have X, Y, and Z?
It's interesting stuff, but I remain skeptical.
/mc