HOW TO: Troubleshoot Problems That Are Caused by the .NET Framework Security Configuration
http://support.microsoft.com/default.aspx?scid=kb;en-us;815163
How to back up and restore .NET Framework configuration and security policy files
http://support.microsoft.com/default.aspx?scid=kb;en-us;815168
HOW TO: Build and Deploy a .NET Security Policy Deployment Package
http://support.microsoft.com/default.aspx?scid=kb;en-us;815173
Microsoft .NET Framework configuration files in a side-by-side installation environment
http://support.microsoft.com/default.aspx?scid=kb;en-us;815441
INFO: Deploy an Enterprise Security Policy Before You Install the .NET Framework
http://support.microsoft.com/default.aspx?scid=kb;en-us;816641
HOW TO: Use the Performance Administration Tool to Analyze Performance of .NET Framework-based Windows Application
http://support.microsoft.com/default.aspx?scid=kb;en-us;815158