PostSharp is an free, open-source and extensible platform for enhancement of .NET assemblies, that is: PostSharp transforms assemblies after compilation. Pretty abstract, isn't it? Not so much. It has great applications. PostSharp Laos, a Lightweight Aspect-Oriented Solution, provides aspect-oriented programming (AOP) to .NET Developers without the learning curve. This tutorial presents an introduction to the PostSharp programming language, one that's more than sufficient to get you started. Take a look.