I saw that someone has created a list of the best science books of 2011 based on many newspapers and websites here: http://popsciencebooks.com/psychology-2/best-science-books-of-2011

What is the best popular science book that you've read this year?

Hey, nice list, thanks!
I've been out of the reading loop for a while.
I liked James Gleick's writing style very much when I read Genius about Richard Feynman - just difficult enough but not too. I'd read anything he wrote.

"Science" is a very broad term. Did you mean a leisure reading book, a textbook?
Science through history?
Political Science
Management Science
Computer Science
Astronomy?
Physics
Biomechanical Science...
There are a lot of categories to choose from, can you be more specific?