I really LOVED the Rama series by Arthur C. Clarke. It's a sci-fi series thats explores creation, humanity, meaning, etc... I haven't read it in a long time but i'd really savor going back to enjoy it again.
Fast Car Physics, is a book written by a witness to some of the greatest drivers of yester-year. He does a really good job of talking about even terms we THINK we understand in a profound way (eg over/understeer).
Ender's Game was an absolute favorite of mine as a "kid." If you've seen the movie, and enjoyed it at all, the book is so much better.
East of Eden is my favorite of the sorta "high literature" books. It was just so beautiful.
So if you're at all into Non-Fiction, "Guns, Germs, and Steel" was amazing. The book is an exploration of why certain societies evolved to be so succesful, when others were not (think of the Spanish vs the Incas). REALLLLLLLY fascinating. I'd almost recommend skipping the first chapter (prologue?), which was written in a way where you think "oh I get it already, no need for the whole book" but end up being totally wrong.
Ringworld. Another Sci-Fi favorite from my youth. Man, I need to go back and read it.
Ludlum, anything. He's the author of all the Bourne movies. They're all pretty cool, even/especially not the bourne books.
Thats all for now, many more to come!