An interesting idea that comes from Microsoft: We Rock 247.NET, a complete Smart Client Example.
This project contains material on developing Smart Clients with .NET technologies and is based around a virtual rock group. We Rock 247 .NET takes you through building an enterprise application using Windows Forms, Smart Documents, Smart Tags, Smart Devices (.NET Compact Framework) technologies and much more.
I think it's really a great idea to post complete applications with source to the community... a better way to understand the architecture of an enterprise technology! 