Not every body knows sourceforge etc. You give them a guide.
Hope you can update this article when you find more good open source projects using MFC.
And Can you list some good ASP.NET and C# open source project?
I really like eMule project, learn the UI interface from eMule and network programming.
The #1 should be TaskSwitchXP, because it is great and should have been a native part of winXP , and in 7zip source I need to dig heavily through it to extract functional zip/unzip code of my interest.