I found this article that outlines how to provide code documentation features, that exist in C#, to the VB.Net IDE. The ability to provide an XML file, containing comments, directly from the source code, then manipulate this file into a readable interface, is a great feature. The most likely places where I can see this being used are for internal (i.e. developer, tester, etc.) documentation and for the foundation of external technical documentation (i.e. 3rd party control documentation). All the same, it is very interesting to see this concept for the first time.