From Narita Airport to Tokyo

1. By JR (Japan Railways) Train:
   JR Narita Express (NEX) train runs to JR Tokyo Station from the airport in about one hour and also connects to various stations. Please refer to JR East NEX Information.
   By JR rapid train (kaisoku), it takes about 90 minutes to JR Tokyo Station.
2. By Keisei Railway Train:
   Keisei Skyliner connects the airport and central Tokyo within one hour.
   For more information: Guide to Narita Airport Accessby Keisei Elecrtic Railway
3. By Bus:
   Airport Limousine offers many bus routes, and the traveling time changes, depending on traffic conditions. Please refer to Airport Limousine Website.

Source: 

http://gojapan.about.com/cs/transportation/ht/ht_naritaaccess.htm