Urban Jungle Street View is a Google Street View mashup that pulls out the 3D information latent in the Streetview database and uses it to map lush, ecotopian foliage over the surfaces of the buildings and street furniture. You can put your own address in and see your home covered in climbing jungles and explore from there, or use great architectural landmarks as your starting point. Shown here: the Flatiron building in midtown Manhattan, where my publishers are located.
Its creator, Einar Öberg, has created a ton of other amazing mashups based on similar principles.
(via Waxy)