Just got done with
Blindsight by Peter Watts, and I'm still having trouble getting my mind around all the concepts in it. It's super-hard SF, where the science is "cognition science". What is intelligence? What is sentience? What's the difference?
Since the sales of the hardcover were so disappointing, Tor decided not to do a second printing. Watts was upset, so he grabbed back the rights to it and posted the entire thing on his
website. He also has added a hell of a lot of background info to his website.
Download it, read it, and if you like it, send him some money via PayPal.
(It's got vampires, too.)