There’s another fun web app to use with Twitter. It’s called Twitter Grader. It isn’t quite as useful as some of the apps growing up around Twitter, but it’s fun to play with and get your “grade.”
RDFa, Drupal and a Practical Semantic Web at CMS Wire is a terrific piece in clear language that explains what a sematic web is and how RDFa fits into that concept. It also will help RDFa newbies grasp what it’s all about.
WebAIM’s WCAG 2.0 Checklist. WebAIM has simplified and organized the WCAG specs into an easy to use format with simplified explanations of how you can meet the standards. This would make a great handout or required reading assignment to add to your students’ reading lists. It could also be useful as a grading rubric for assignments that are required to be accessible.