Here we have the oddest question (so far): A non-fiction book that you actually enjoyed.
I prefer non-fiction so to pick one I actually enjoyed would be pretty much all of them or else I wouldn't keep reading non-fiction. I liked Shannon's answer when she decided to pick a cook book which could be read like a book (as you should be able to do with all good cook books as far as I'm concerned). I thought that was a great idea. (Non-fiction? I'll show you non-fiction!)