I love looking at trees, and I've been really interested learning to identify them. This book was on sale at Barnes and Noble, but I also compared it to the Audubon and Smithsonian field guides, and actually liked this one the best. It's in full color, and most of the entries show the whole tree as well as closeups of the leaves, bark, and fruit. Love it.
National Geographic Field Guide to Trees of North America (Paperback) by Keith Rushforth (National Geographic Field Guide to the Trees of North America by Keith Rushforth and Charles Hollis (National Geographic 2006) (582.16097). This is an intro to the trees of the United States. My rating: 7/10, finished 2007.
I bought this because I'm an artist and trees are one of my favorites to express emotion in drawings and paintings. slim field guide if you are indeed interested in taking it to identify trees. NatGeo never misses with books.