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Gundam Mailing List
http://gundam.aeug.org/
Question and answer mailing list. Features frequantly updated mail archives.
Gundam Mailing List: Archive
http://www.gundam.com/gml/
A collection of articles edited from previous archives of the Gundam Mailing List.
Gundamfan.com
http://www.gundamfan.com/
Offers email, message boards, and a chatroom. [English or Japanese]
GXML
http://groups.yahoo.com/group/gxml
An online discussion list for After War Gundam X TV series.
SD Gundam Discussion Board
http://network54.com/Forum/10935
An online discussion board for the world of SD Gundam.