LOVED THE CRAP OUT OF THIS. Seriously. Read it.
Things I didn't know about the book Yes Man before I picked it up to read it:
#1 - IT'S BRITISH. I didn't know that. It's British humor and therefore immediately five times more fantastic.
#2 - It's a mostly true story. The author really did these things. He says everything's true, just some of it may not happen in exactly the same order for the sake of story-telling.
#3 - It is FANTASTIC.
Seriously. Fantastic. I've seen lots of people say that others should read it, and I'm going to say the same thing. If you haven't read Yes Man yet, DO IT.