Came across Connected Information Security Group's Blog.  There are 2 new tools to help diagnose code for security vulnerabilities; CAT.NET and Anti-XSS both in early review releases.

I am more interested in testing CAT.NET for testing within Visual Studio.

Check it out for your applications.

http://blogs.msdn.com/cisg/archive/2008/12/15/anti-xss-3-0-beta-and-cat-net-community-technology-preview-now-live.aspx