Brian Chandler maintains a text archive of Honyaku traffic (previously maintained by Tom Gally).
Ryan Ginstrom has created a searchable database of the Honyaku archives, called honyaku-archive.org appropriately enough. This is up to date, and takes over from a previous version created by Asako Mizuno.
Not Honyaku: For discussions not suited to the Honyaku list.
Honyaku OSX: For discussions of interest to Japanese translators using the Mac OS X operating system.
Nihongo-computing: For discussions of Japanese-language issues in computing.
The Japan Association of Translators holds monthly meetings in Japan, publishes a newsletter, and sponsors the IJET conference.
The Society of Writers, Editors, and Translators is based in Tokyo, holds monthly meetings and other events, publishes a newsletter, Wordcraft (a compendium of articles from its newsletter) and the Japan Stylesheet.