Today we kicked off the first meeting for the "ARIA User Agent Implementation Task Force" (UAI-TF). Our primary goal is browser compatibility in our WAI-ARIA implementations for DHTML accessibility -- vital stuff. The group is very lean and today there was representation from browser people at Microsoft and Mozilla.
If you are an Opera, Webkit, or Safari accessibility developer please consider joining us.
Aside: a big shout out for Aaron Leventhal for planting the seeds of this, and for the excellent and detailed document he created to guide browser developers on ARIA implementation.