The following are some links to available patterns & practices Security Guidance on MSDN.

Short Cut URLs

• /ThreatModeling
• /SecurityGuidance
• /SecurityEngineering

To use, append to the end http://msdn.com.

Indexes

• Security Guidance Index: http://msdn.microsoft.com/SecurityGuidance 
• Security Engineering Index: http://msdn.microsoft.com/SecurityEngineering 
• Security How To Index: http://msdn.microsoft.com/library/en-us/dnpag2/html/SecurityHowTosIndex.asp 
• Threat Modeling: http://msdn.microsoft.com/ThreatModeling

Views

• Security Guidance for .NET Framework 2.0: http://msdn.microsoft.com/library/en-us/dnpag2/html/AppSecGuidanceForFrameworkV2.asp?frame=true 
• ASP.NET 1.1 Security Guidance Index: http://msdn.microsoft.com/library/en-us/dnpag2/html/ASPNET11SecurityGuidanceIndex.asp?frame=true 
• ASP.NET 2.0 Security Guidance Index: http://msdn.microsoft.com/library/en-us/dnpag2/html/ASPNET2SecurityGuidanceIndex.asp?frame=true

ASP.NET 2.0

• ASP.NET 2.0 Security Guidance Index:  http://msdn.microsoft.com/library/en-us/dnpag2/html/ASPNET2SecurityGuidanceIndex.asp?frame=true 
• ASP.NET 2.0 Security Guidelines: http://msdn.microsoft.com/library/en-us/dnpag2/html/PAGGuidelines0001.asp?frame=true 
• ASP.NET 2.0 Security Checklist: http://msdn.microsoft.com/library/en-us/dnpag2/html/PAGCK0001.asp?frame=true 
• ASP.NET 2.0 Security Practices: http://msdn.microsoft.com/library/en-us/dnpag2/html/PAGPractices0001.asp?frame=true 
• ASP.NET 2.0 Security How Tos: http://msdn.microsoft.com/library/en-us/dnpag2/html/SecurityHowTosIndex.asp?frame=true

Security Engineering

• Security Engineering Index: http://msdn.microsoft.com/SecurityEngineering 
• Web Application Security Engineering Index: http://msdn.microsoft.com/library/en-us/dnpag2/html/WebAppSecurityEngIndex.asp?frame=true 
• Security Architecture and Design Review Index: http://msdn.microsoft.com/library/en-us/dnpag2/html/SecurityArchAndDesignReviewIndex.asp?frame=true 
• Security Deployment Review Index:  http://msdn.microsoft.com/library/en-us/dnpag2/html/SecurityDeploymentReviewIndex.asp?frame=true 
• Threat Modeling Web Applications: http://msdn.microsoft.com/library/en-us/dnpag2/html/TMWA.asp?frame=true