When I type "///" in the editor, Visual Studio creates an empty comment body with the < summary > and other tags. I can then type the "<" and VS suggests a list of recommended tags.
How can I make the IntelliSense to suggest my custom tags here?
Ideally, I would like to have my own XML documentation template expanded when I type "///"
Have a look at this. It is primarily targeted at VS2005 en 2008, but it's probably still valid for 2010 with minor differences.
Documenting Your Code With XML Comments