Does VS2010 or .NET 4.0 have any new tooling support for Accessibility?

What kind of tooling support or helpers does VS2010 or .NET 4.0 provide to developers in the way of accessibility?

• Anything new for creating 508-compliant markup?
• Anything new in the wa开发者_开发技巧y of supporting WAI-ARIA specific attributes on AJAX-updatable elements?

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here are some links, if you have not already seen them:

ASP.NET Controls and Accessibility

Accessibility in Visual Studio 2010 and ASP.NET 4