The Visual Studio partner team has put together a resource DVD with products and information from over 90 Visual Studio partners. It’s loaded with more than 100 add-ins and packages—full and trial versions. You’ll get tools, languages, and components that can help you develop applications for Windows®, Web services, and mobile devices.
From these examples you can find out just how flexible & extendable Visual Studio is.
You can order their own DVD, free of charge, at: http://msdn.microsoft.com/vstudio/extend/partnerdvd/