While I realize this has been suggested a number of times, recent developments with TinyMCE suggests to me that the time is now for implementation... particularly as we've just moved to the new forum design:
A spellchecker.
TinyMCE has an opensource spellchecker built into their WYSIWYG editor, and it doesn't take much to implement.
Running posts through OpenOffice or Word works, of course... but few people want to write their posts in a separate program - particularly if they're posting on a work computer, a public computer, or just someone else's computer.
*shrugs* I think it might contribute to communication on the forum, so I'm throwing this out to the community and the Team for consideration. Thanks!