Not sci-fi or fantasy as I haven't read books in those 2 genres for a number of years, but ....
I highly recommend Angels and Demons and The Da Vinci Code by Dan Brown
I've recently been reading through Brad Thor's books. Awesome books if you like Tom Clancy type stuff.
Clive Cussler books are always entertaining, though some more than others.
I've also enjoyed W.E.B. Griffin. His style is also alot like Clancy's.
About 10-12 years ago, I read through everything David Eddings had written. That would fall in the fantasy genre. I remember them being very entertaining. I've also thought Michael Crichton's books were much, much better than his movies. I really liked Jurassic Park. I remember it being a little more "dark" than the movie.