Note: this entry has moved.
This is an awesome collection of security links for your toolbox. If you already know the theory about engineering for security, then you may go straight to the meat and check it out these cool How Tos (for .NET v1.1 and .NET v2.0).And if you are working with Service Orientation and still wondering how to nail down the right security pattern, do not miss this workspace. So summarizing; Theory:Security Guidance For Applications Practice:Security How Tos Service Orientation:Service Orientation Patterns