Feature Stapling (MSDN Library): http://msdn2.microsoft.com/en-us/library/bb861862.aspx
SharePoint Access Checker Web Part (CodePlex): http://www.codeplex.com/AccessChecker
Code Access Security in Practice (MSDN Library–Patterns & Practices): http://msdn2.microsoft.com/en-us/library/aa302424.aspx
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