The following is an index of the patterns & practices Security Guidance released as part of the Security Guidance for .NET 2.0 project. 

Short-Cuts
You can append SecurityGuidance, SecurityEngineering, or ThreatModeling to http://msdn.com or http://microsoft.com .

• Security Guidance Index: http://msdn.com/SecurityGuidance
• Security Engineering: http://msdn.com/SecurityEngineering
• Threat Modeling: http://msdn.com/ThreatModeling

Indexes

• Security Guidance Index
• Security Engineering Index
• Security How To Index
• Security Code Review Index
• Security Guidelines Index
• Security Checklists Index
  

Views

• Security Guidance for .NET Framework 2.0
• ASP.NET 1.1 Security Guidance Index 
• ASP.NET 2.0 Security Guidance Index

ASP.NET 2.0

• How To: Configure MachineKey in ASP.NET 2.0
• How To: Connect to SQL Server Using SQL Authentication in ASP.NET 2.0
• How To: Create a Service Account for an ASP.NET 2.0 Application
• How To: Encrypt Configuration Sections in ASP.NET 2.0 Using DPAPI
• How To: Encrypt Configuration Sections in ASP.NET 2.0 Using RSA
• How To: Instrument ASP.NET 2.0 Applications for Security
• How To: Prevent Cross-Site Scripting in ASP.NET
• How To: Protect Forms Authentication in ASP.NET 2.0
• How To: Protect From Injection Attacks in ASP.NET
• How To: Protect From SQL Injection in ASP.NET
• How To: Use ADAM for Roles in ASP.NET 2.0
• How To: Use Authorization Manager (AzMan) with ASP.NET 2.0
• How To: Use Code Access Security in ASP.NET 2.0
• How To: Use Forms Authentication with Active Directory in ASP.NET 2.0
• How To: Use Forms Authentication with Active Directory in Multiple Domains in ASP.NET 2.0
• How To: Use Forms Authentication with SQL Server in ASP.NET 2.0
• How To: Use Health Monitoring in ASP.NET 2.0 
• How To: Use Impersonation and Delegation in ASP.NET 2.0 
• How To: Use Medium Trust in ASP.NET 2.0
• How To: Use Membership in ASP.NET 2.0
• How To: Use Protocol Transition and Constrained Delegation in ASP.NET 2.0
• How To: Use Regular Expressions to Constrain Input in ASP.NET
• How To: Use Role Manager in ASP.NET 2.0
• How To: Use the Network Service Account to Access Resources in ASP.NET
• How To: Use Windows Authentication in ASP.NET 2.0