Design Pattern Code Library
Some more material for the starter architect....
 |  | Software Design Patterns Design patterns are recurring solutions to software design problems you find again and again in real-world application development. Design patterns are about design and interaction of objects, as well as providing a communication platform concerning elegant, reusable solutions to commonly encountered programming challenges. |
The Gang of Four (GOF) patterns are generally considered the foundation for all other patterns. They are categorized in three groups: Creational, Structural, and Behavioral. At data & object factory web site you will find information on these patterns together with downloadable source code in C#.
Update: Some more design patterns in c#
Illustrated GOF Design Patterns in C# by series of articles by ian mariano on Code Project
Part I: Creational
Part II: Structural I
Part III: Structural II
Part IV: Behavioral I
Part V: Behavioral II
Part VI: Behavioral III
Ohad.