Google Maps just announced the addition of street-level panoramic photos in five cities -- NYC, LA, San Francisco, Las Vegas, and Denver. It's called "Street View" and it allows you to virtually stand on the street, look around, and even walk down the street if you like.
The NY Times reports: Google said that the images had been captured by vehicles equipped with special cameras. The company took some of the photographs itself and purchased others from Immersive Media, a data provider.
The question that always comes to mind with such imagery is that of privacy. For example, in the below photo, I believe that's my wife's white car parked at the building where this lawyer works that I think she's been having an affair with... (Okay -- Just kidding! But you get the point). Be careful what you ask for.