HTML 5 vs. EPUB 3 - http://toc.oreilly.com/2012/09/html5-is-the-way-forward.html - at 9:25 describes the current state of eReaders vs. HTML 5 in browsers. Example used was a Nook eReader unable to display canvas elements in an EPUB, but was able to render it using the Nook Browser.
MathJax.org (Date unknown) - Resource has catered EPub 3 information to show where MathLM is supported
EPUBTest Results - Development is sponsored by the Daisy Consortium and the Book Industry Study Group. Copyright International Digital Publishing Forum.
Poet Image Description Tool - http://diagramcenter.org/development/poet.html. A web-based tool for creating and providing guidelines to writing image descriptions for images in existing DAISY and EPUB books.
MathML Cloud Tool - http://mathmlcloud.org. A math conversion tool that creates both images and alternative descriptions of math equations on the fly.