Wow, a great idea from the SharpDevelop team... the book "Dissecting a C# Application: Inside SharpDevelop" published some times ago by Wrox, is now free to download on PDF format from HERE.
The developers who created SharpDevelop give you an inside track on application development with a guided tour of the source code for SharpDevelop. They will show you the most important code features and explain how you can use these techniques in your own projects. You will gain valuable experience of building an application on this scale, learning from the decisions, mistakes, problems and solutions that lead to the current version on SharpDevelop.
An interesting download... thanks guys! The problem now is finding some times for reading... 