I think a Japan forum would be rather useful for a few reasons:
- it would be a good place for questions pertaining to Japanese-learning/-related software
- there is a lot of Zaurus software/information/projects that are never heard of outside of Japan; a Japan forum might be a good place to collect such info
- most importantly: as Stubear said, there are apparently a number of Japanese lurkers on the board; if there was a section of the board that allowed for use of Japanese (i.e. kanji), it might entice some of the lurkers to post.
I agree with you: there are already a couple of regional forums for Asian countries, but no Japanese forum yet, despite the obvious fact that the Zaurus comes from that country and that it does have a community of dedicated developers and fans.
I vote in favor of such a forum creation. As you mentioned, Ashikase, maybe this would entice Japanese users to participate more to these discussions if they could start expressing themselves in Japanese (even though everyone else won't understand a single word), or at least discuss amongst Japanese users, which might be less intimidating.
And in the end, if a side effect of this is that we (non-Japanese users) get bits and pieces of news that usually don't make it outside of Japan, well, I wouldn't complain about that!