That's for sure, Lox. The only movie I think I've ever seen that may have been better in some respects than the written work that inspired it was "The Man Who Would Be King", with Michael Caine and Sean Connery. I think it was even better than Kipling's short story (which was great)...but it was only a short story, after all, so it was possible in that case to make a feature length movie that could effectively deal with pretty much everything that was in the original text.

There have been some pretty crummy books written after a movie was made, just to capitalize further on the success of the film, but that's a horse of a different color. They are sort of like the "Cole's notes" version of the movie... ;-) Can't think of a specific example at the moment, but I know there have been plenty of them.