Forum .LRN Q&A: ACollab, Accessible Collaboration Environment
From the Adaptive Technology Resource Centrea at University of Toronto, developers of ATutor http://www.atutor.ca/atutor/index.php comes ACollab, an accessible collaboration environment.
Interesting points: all applications and administration pages were built with accessibility in mind. ACollab can run alone or with the Atutor LCMS.
I think this is a very important issue for .LRN. I know the administration pages are probably not at all accessible. I think possibly the application pages are better, but I don't believe there has been much focus overall on accessibility.