Free! TURNING OVER A NEW LEAF: Leafsnap is a dandy, iOS-based summertime tool. Load it on your iPad, then drop a leaf on the screen: Leafsnap will identify the tree genus. Also gorgeous high-res pictures of leaves, flowers, fruit, petiole, seeds and bark. Made by researchers at Columbia University, the University of Maryland and the Smithsonian based on data made available through the Data.gov program, Leafsnap currently favors trees of the northeast. But don't worry: the rest of the forest is on its way.
