Transportation

Keisei Skyliner - Airport express that connects Narita Airport with downtown Tokyo (Nippori and Ueno Stations). Ticket information, timetables, and relevant station maps.
http://www.keisei.co.jp/keisei/tetudou/keisei_us/top.html

Tokyo Subway Map - Detailed color map of Tokyo subway lines with station names written with Japanese characters and Western letters (400kb).
http://www.bento.com/subtop5.html

Tokyo MK Corporation - Information on the Narita skygate shuttle service. Company provides door-to-door shuttle service to Narita Airport.
http://www.tokyomk.com/eng/

Tokyo Metro Co., Ltd. - Limited English-language version of the main page. Includes subway map, ticket and pass information, lost and found guide, and image gallery.
http://www.tokyometro.jp/e/

JR-East: East Japan Railway Company - Provides information on purchasing tickets, access to Narita airport, rail passes, and English information services. Also includes maps of major staions, travel packages, and details concerning Shinkansen service.
http://www.jreast.co.jp/e/

Forest Bus - Licenced to run chartered bus from Tokyo. Information of reservation and type of the buses.
http://www.forestbus.jp/english/

Odakyu Electric Railway Co., Ltd. - One of the Tokyo-area private railway lines. Sightseeing and rail access information for the Hakone, Kamakura, Izu and Mt. Fuji areas. Details concerning passes and seasonal specials.
http://www.odakyu.jp/english/

Keihin Electric Express Railway Co., Ltd. - Provides service to Hanada Airport. Ticket guide, service map, and information concerning Hanada Airport buses. All information in PDF format.
http://www.keikyu.co.jp/worldwide/

Toei Transportation Information - Information concerning the Toei Subway lines, buses, and streetcars. Details for passes, fares, and general ticket information. Limited version of Japanese language site.
http://www.kotsu.metro.tokyo.jp/english/