I like Scout. It's sweet and adorable, but I think I prefer it as a nickname. I've never actually met a Scout. The only one I've heard of is Scout from To Kill a Mockingbird.
DittoI loved To Kill a Mockingbird and I loved Scout. But just as Scout wasn't her real name (JeanLouise), I'm not too big on it being used as a full name for someone else either. It really has to fit the girl too, I don't think everyone could nicely sport a name like Scout.