Lord of the Rings, of course. I actually liked the Peter Jackson movies, but the books are a million times better. And the Bakshi version shouldn't have been allowed to exist. Rankin-Bass at least had the decency to make great backgrounds.

Chronicles of Narnia. As bad as the BBC versions were, they were more charming than the most recent one.

Harry Potter. 'nuff said.

Series of Unfortunate Events. You just can't get that amazing writing to translate wonderfully to the screen. You just can't.

Pride and Prejudice. I, too, adored the BBC version, but the new one fell flat. And Colin Firth is the ONLY Mr. Darcy.