Accessibility for Web Design
Accessibility for Web design [1] contains a set of videos designed around improving web accessibility.
Creating Accessible Documents in Microsoft Office
Creating Accessible Documents in Microsoft Office [2] contains several short videos which provide an overview of the application of accessibility guidelines in various Office programs.
Creating Accessible PDF's
Creating Accessible PDF's [3] contains a set of videos designed around creating accessible PDF documents. Also check out the Advanced Accessible PDF training course [4].