Accessible windows 8 Metro app

I came across this very good article on how to write accessible metro apps with html 5 and javascript. It is mostly the same things as those you would use to create an accessible web page but is a good place for someone looking for accessibility guidance for windows 8 metro apps:

ARIA and UI frameworks

ARIA is the upcoming w3c recommendation for making rich internet apps accessible.
I tried looking around for how many rich application platforms/development libraries are building support for this. Here is what I found:
- Silverlight2 has announced support for ARIA this year.
- ASp.net is not talking about ARIA anywhere that I could find. They are sticking with the existing accessibility they have with html...although I would have thought it would have been better with all the interactive features being packed into asp.net controls.
- Flash is still with the MSAA world. I don't know enough about Flash to say if they will move to ARIA or UIA going forward.
- DOJO is an ajax toolkit that is building ARIA support in its widgets. However, my browser hangs every time I try to visit dojo's accessibility page.
- Ruby doesn't seem to be talking about ARIA either. But again I don't know enough about ruby to say that I've looked around enough to state this.