One of my favorite extensions for Visual Studio is called VS10x Comments Extender. It allows you to setup custom formatting for comments that are typed in a certain manner.
From the VS10x page:
How does it work? Well, when you start a comment with // (C#, C++, F#) or ' (VB), you can add some extra characters (minimum one, maximum three) in order to define how this comment will look like. VS10x Comments Extender will interpret these prefixes and format the comment accordingly.
* Note that this should be extended to support as many languages as possible, not just those listed in the quote above.
It REALLY helps to see this in person... There's a very simple screenshot below, but there's MUCH more it can do. Click the link below to see examples in action for everything else it can do.
http://visualstudiogallery.msdn.microso ... ?SRC=VSIDE