Accessibility is an important goal for any Content Management System that aims to support as many users as possible. There is a lot to learn to meet not only the legal guidelines for web accessibility but also the vision that guides such legislation.
In mojoPortal I have gone to significant efforts to make things as accessible as possible. Much of the accessibility of a site is dependent upon the website UI developer so while we may do things to be sure mojo is accessible out of the box, UI developers need to keep this in mind for their sites.
For developers interested in techniques for accessible design, we have a list of resources. If you know of good links to helpful resources let us know.