Examples of design patterns implemented in Ruby
A pattern is usually described as an abstraction of a solution to a problem in some context.
http://www.rubygarden.org/ruby?exampledesignpatternsinruby

Exploring the Singleton Design Pattern
Discusses the Singleton design pattern, a creational pattern to dictate how and when objects get created, and its effective use with the Microsoft .NET Framework.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnbda/html/singletondespatt.asp

Builder Design Pattern Implementation in C# and VB.NET
The Builder pattern allows a client object to construct a complex object by specifying only its type and content. The client is shielded from the details of the object’s construction
http://www.vbcity.net/net/article.aspx?cid=2&y=2002&m=2&d=24

Exploring the Factory Design Pattern
Discusses the Factory creational pattern that uses a specialized object solely to create other objects, much like a real-world factory. The logical and physical models of this pattern are examined, as is one use of this pattern in the Microsoft .NET Framework.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnbda/html/factopattern.asp

Model-View-Controller
Her forklares hvordan MVC, som er den arkitektur Ruby on Rails er bygget på, virker.
http://ootips.org/mvc-pattern.html