While I was at DevConnections last week, I watched an interesting demo showing off Visual Studio's extensibility. In the demo the visual studio shell is being used to edit Lua script; the scripting language used by World of Warcraft for designing custom interfaces. The demo showcased Visual Studio's flexibility and captured the audience's attention pretty well.
The speaker added an interesting interface into World of Warcraft which showed images and played sounds when she killed enemies. I think it will be nice to use Visual Studio for almost any programming language. The familiar environment will make things easier. Perhaps more add-ons for Visual Studio will be available in the near future. This WoW Lua add-on is supposed to be available on CodePlex soon.
I don't play World of Warcraft, so I will be waiting to see what extensions other people will decide to make.