As title says, Google Maps StreetView is now available in Japan for selected cities. Presently, it covers Tokyo, Yokohama, Saitama and Chiba in Kanto, Osaka, Kyoto and Kobe in Kinki, Sendai in Tohoku and Sapporo and Hakodate in Hokkaido.

Currently Google's servers are getting hammered due to the service's novelty. The images still get loaded after some delay.

I am going to have some fun with this.