[FYI] Joomla 1.6 adds a11y admin backend with WCAG/ATAG

http://www.compassdesigns.net/joomla-blog/hathor-the-new-joomla-16-admin-template

"An aspect of web accessibility, especially for content management 
systems, that often gets overlooked is accessibility of authoring tools 
(ATAG). TinyMCE, a WYSIWYG editor that comes standard with Joomla has 
made a commitment to meeting ATAG 2.0 guidelines. "