My name is Constantine and I'm a lead developer on the MSDN team. One of my past projects is GotDotNet, and the favorite application there is Workspaces. If you haven't already - make sure to check it out.
Among other useful features it's a great tool for online source control needs. While it's quite reliable now, we've definitely learned good lessons on building .NET applications to scale and perform for millions of users. I'll dedicate this blog to sharing these learning experiences and best development practices that I've come across.