Accessibility has been a concern for me ever since my third online teaching experience when I had a blind student in my class. I admit that it had never even crossed my mind to think about accessibility issues. I very quickly learned that Blackboard (this was when I still used Bb for teaching) was . . . less than adequate for the job. I’ve heard since than that it’s improved, but I wouldn’t know.
Even though I’m not entirely on top of the accessibility issue (it is, unfortunately, one of those aims that ends up coming last in the course planning), there are two resources I look to when attempting to improve accessibility:
Accessible Futures: This is very limited right now, but it may expand. It is primarily useful for the WordPress plugin it provides called Access Keys, which allows a web admin to easily manage keyboard shortcuts to various parts of the site.