Kevin Kelly has added photographs to his 1994 book "Out of Control" and made it available as a free PDF download. He's experimenting with contextual ads, displayed alongside the document. They are opt-in, which is cool.
I found the book very fascinating. It was one of the inspirations for the technological future portrayed in the Matrix. I wonder if it is getting old now though- some of the cutting edge phenomenon he wrote about is much more developed today.
Ray Kurzweil (not very openly) critiques these kinds of books as lacking scientific backing for their claims.
