Recently Scott announced some really exciting news for .NET developers that his team has been working to enable the ability for .NET developers to browse and download source code of .NET Framework Libraries and also with debugging support.
This feature will be available with .NET 3.5 and Visual Studio 2008, which is expected later this year.
Microsoft will begin with offering the source code for .NET Framework Libraries including:
* System
* System.IO
* System.Collections
* System.Configuration
* System.Threading
* System.Net
* System.Security
* System.Runtime
* System.Text
* ASP.NET (System.Web)
* Windows Forms (System.Windows.Forms)
* ADO.NET (System.Data)
* XML (System.Xml)
* WPF (System.Windows)