Since April 2008 the Tokyo Metropolitan Government Bureau of Transportation has been operating the Tokyo Shitamachi bus, a route bus that links several sightseeing spots in the metropolitan area. It runs from Tokyo Station to Ryogoku Station, with stops at Nihombashi, Akihabara, Ueno, Kappabashi, and Asakusa in between. A multilingual website will be opened to increase awareness of this bus service among visitors to Tokyo from overseas.
English site here