Virtual Underworld has a quick note about 3D virtual Manhattan in Google Earth, with a note on quality:
this has got to be the largest and most ambitious one done to date, and could possibly set the standard for building the entire Earth this way. Take it from me, I know my “mirror worlds”.
That being said, I have seen better: Geosim Philly is far more detailed. Ditto Twinity’s Berlin build. Also there is a fabulous Forbidden City. These three even exceed some of the best mirror worlds in Second Life.