To my surprise, I discovered that the book is quite different from the movie. In the novel, Jason Bourne is trying to dodge Carlos the assassin and his minions, as well as the authorities; Carlos isn't even involved in the cinema version as best I can remember. And there's surprisingly little high technology. Witness this sentence:
"Jason kept his eyes on his watch, the infinitesimal jumps of the thin, delicate sweep hand too agonizingly slow."I picture a whole new generation of readers asking "Daddy, what's a 'sweep hand'?" Except the "new generation" won't read the book; they'll only see the movie.
It's still an excellent book. Even if you've seen the movie.