Hunt for Red October. Book and movie were both fantastic.
2010. Movie had a lot of cool parts, and the book had more. Wish they had been able to intregrate the Chinese team into the movie.
The Relic. Fun, cheesy movie, and the book works very well.
The Name of the Rose. The book is a bit dense and slow at times, but weaves a good mystery. And Connery in the movie rocked. Plus I thought the movie ended better.
Jaws was fvcking awful! Spielberg worked miracles on the source material to turn it from a crappy soap-opera-with-fish to the iconic thriller it became.