T.V. Raman reports the latest Google ARIA addition goes to Google Health. See also the related article in eWeek. It makes good business sense, and is a good move for many reasons.
Google's approach, of sending ARIA over the wire only when necessary, intrigues me, but I think there must be a better way of automating the decision. Are users comfortable setting "enable screenreader support" as a preference? It seems many people are generally concerned about giving away too much information about themselves...
T.V. lists the key-bindings for using this Web 2.0 application and they look like they gel with the DHTML Style Guide. Nice work Google.
The W3C draft specification: WAI-ARIA continues its emergence as the solution for providing Web2.0 experiences for everyone.