I like fiction and nonfiction.
Really am a fan of Dan Brown, that type of stuff.
Argh! Dan Brown is a hack!
(sorry, sorry....don't mean to offend people here...)
If you like the kind of thing Dan Brown writes, you need to step up to the master of the Medieval-Modern mystery thriller and read just about anything by Umberto Eco - "Foucault's Pendulum" comes to mind. It's a fascinating book, but it's hard to read. Eco is an utterly brilliant writer.
"Cryptonomicom" by Neal Stephenson is probably the most fun I've had with a book in 10 years. I've read it several times and keep coming back to it every few years. Takes about 200 pages to REALLY get going but it positively kicks arse. It's got a little bit of everything.
"Gravity's Rainbow" by Thomas Pynchon. I'll bet you a case of beer that you can't finish this one on your first try. It's a bet I made and lost the first time I tried to read it. It's almost painful, but amazing that someone writes the way he does.
Any of the "Star Wars" books written by Timothy Zahn. In my opinion, the best of the fan-fic writers out there.
"Ender's Game" by Orson Scott Card. One of my all-time favorites. Beautiful story about a child genius who is bred for war. Major themes about love, generosity, genocide, loyalty. Stunning book.
Honestly, the Harry Potter books are fine reading, too. Enjoyed all of them.
Dean Ing's "The Ransom Of Black Stealth One" - techno thriller about a guy who steals a very special stealth aircraft. Not quite what you'd expect, but fun.
Charles Stross's - "The Atrocity Archives" - sorta like Hellboy meets The Office. Very cool, very funny.
"Moonlight" or "Madhouse" by Rob Thurman - vampire/detective novels. Sex, violence, brotherly loyalty and mystery. Cool books.
Peter F. Hamilton's "The Night's Dawn" trilogy. This is comprised of six books, actually, starting with "The Reality Dysfunction." Think of it as a giant space-opera. The scope of his work is impressive. Lots of fun. Space ships, aliens, physics, supernatural zombie-type-stuff, economics, sex, violence, faith, redemption, biotech...the list on these goes on. Unbelieveably fun to read. I've been known to stay at home on a weekend and do nothing but read these.
I could keep going, but these are mostly favorites. You're also welcome to come by my house and borrow anything I've got.