Slashdot has just posted a book review of Constructing Accessible Web Sites (book excerpts at Amazon). The book includes a chapter on Flash on which the reviewer offers the following:
I was surprised that chapter 10 was devoted to Flash, as I expected that Flash coverage in an accessibility book would be limited to a few paragraphs lambasting Macromedia for creating such an inaccessible technology. Well, it turns out that the new version of Flash supports accessibility much better than previous ones. This chapter was a real eye-opener for me. Clearly there is more work to be done but well done to Macromedia for putting accessibility support in!
You can read the entire review, and comments here.