The Trouble with Physics - Lee Smolin
One of the best modern physics books around. Not very technical, and discusses the current state of physics and the problems faced by modern science.
The Emperor's New Mind - Roger Penrose
A little on the technical side, but not as much as the average Penrose book. This one is about modern science and conciousness.
entanglement - Amir Aczel
About quantum entanglement.
Einstein's Cosmos - Michio Kaku
Im not a big Michio fan but this is a pretty good one. Not very technical.