One of the things we are asked repeatedly from our Federal customers is how to ensure web applications are 508 compliant.  We have heard you loud and clear and built rich accessibilty support into ASP.Net 2.0 and Visual Studio 2005.  Have a look at the following resources to find out more:

Accessibility Support in ASP.NET (http://msdn2.microsoft.com/en-us/library/ms228004.aspx)

ASP.NET Accessibility (Visual Studio) (http://msdn2.microsoft.com/en-us/library/ms178443(en-US,VS.80).aspx)

Building ASP.NET 2.0 Web Sites Using Web Standards (http://msdn.microsoft.com/asp.net/default.aspx?pull=/library/en-us/dnaspp/html/aspnetusstan.asp)

-Marc