Not sure how many people remember the old Terrarium application, but it is making a comeback. This time, as a project for and by the community.
You can get more information on the background and what this application is by reading Reintroducing Terrarium, now with 2.0 goodness! This is also mentioned by the Windows SDK folks on their blog, .NET Terrarium 2.0 source code now available! and Scott has posted Go to the complete details ...