Stuart has an interesting take on ARAI attributes. Why can't they be set declaratively in an external file in the same way as we set styles?
Call for Review: Updated WAI-ARIA Specification from Shawn Henry on 2008-08-06 (email@example.com from July to September 2008)
Shawn at the W3C wants feedback on the ARIA working draft, particularly "feedback on host language embedding, that is, how ARIA is implemented in HTML, XHTML, SVG, and other host languages." If you don't chime in now, don't bitch later.
The last piece is falling into place. IE8 has ARIA support, Mozilla has ARIA support ...and now WebKit is getting there. Excellent!