Astronomy in Japan: Astronomy in Japan with a lot of information on Japanese Star lore and astronomical history.
National Aerospace Laboratory (NAL): A section of the Science and Technology Agency. Contains Overview, Research Projects and Activities.
National Space Development Agency (NASDA): Information on current projects, library, photos and movies.
Spacetopia: Provides membership info and documents of Japanese organization and a club dedicated to space tourism.
The Institute of Space and Astronautical Science (ISAS): Missions, rockets, scientific ballooning, space science, space technology.
VLBI Space Observatory Program: Includes general information, information for observers, and mission operations.