Joomla! Discussion Forums

Does anyone have any views on which would be the best forum to use with accessible Joomla! for a group of disabled users?

I see accessifyforum.com are using phpBB.

Has anyone used Vanilla with good results in a Joomla! install? http://lussumo.com It looks very good code wise.

Many thanks in advance

It's my understanding SMF (http://www.simplemachines.org/ ) does a good job in this regard.  I use it on my site here http://www.oflanagans.net/northcalviews (click on the tab labeled "Forums!").

I think Vanilla is one of the favorit standard compliant boards...