Michio Kaku is a pretty amazing author. I read Hyperspace in high school and was instantly hooked on theoretical physics. In fact, I am reading Parallel Worlds right now. Also reading:
The Shadow of the Wind by Carlos Ruiz Zaffon (just an excellent book, full of mystery, history and romance)
Bored of the Rings by The Harvard Lampoon (a favorite since junior high. Great parody, but that might just be the nostalgia talking)
I have Parallel Worlds and Physics of the Impossible waiting on my shelf, just not much time to read.
I read In Search of Time a few weeks ago, it was a lot of fun. Just finished SuperFreakonomics, two words: monkey prostitution. That was a blast, I finished it in less than a day. Currently on The Elegant Universe by Brian Greene.