The news may be a bit old, but perhaps you missed it. I did. At the NFB national meeting last summer, the NFB passed Resolution 2008-13 that calls upon publishers to start using MathML instead of images for math in their books. They also call upon AT vendors and braille translation software to "move without delay" to incorporate the ability to handle MathML and render it as synthesized speech and Nemeth braille.
In an earlier post, Pearson adds mathml, I reported the good news that that at least one publisher, Pearson, announced that they are doing just what the NFB calls for: they are making one of their most popular line of textbooks accessible by using MathML for the math in the books. Several AT vendors are starting to take math accessibility more seriously too. We have worked with several of them to make their products speak math. TextHELP and gh have done even more and made use of our synchronized highlighting feature of MathPlayer. Much more can and should be done by others -- most vendors have not made braille generation of math a priority, nor have they taken advantage of some of our more advanced accessibility features You can find a list of what products have what math accessibility features on our AT Math Support web page. If your AT vendor isn't listed there or if the feature you would like is not supported in their product, let them know it is important to you. Companies that want to succeed listen to their customers.