Google Earth Blog writes Google has added photorealistic 3D buildings of New York City to Google Earth.
Basically, Google has completed nearly every building in Manhattan Island for Google Earth. Just fly to "New York City" and turn on the 3D Buildings layer in Google Earth. Tilt your view so you can see the buildings in all their glory. This is the largest city I've seen done with photo-realistic textures to date.
Here's a screenshot of the photorealistic buildings in New York City: