This university-accredited online (international) certificate, jointly conducted by W3C member Media Access Australia and the University of South Australia, is a fully assessed six-week program that covers both accessibility principles and techniques.
This is the first I've heard of accredited certificates in Web Accessibility. Do universities elsewhere offer this as well? If not, they should!
This is fantastic! Basic Accessibility and Usability knowledge should be a requirement for everyone authoring any form of content on the web.
I've not heard of any others - that strikes me as very niche, but on the other hand, there are huge budgets around compliance (in general, not just accessibility). So this might be a great little certification if you wanted to get into the compliance biz.