I love add-ins, who helped me shorten my time to programm. Especially, if i must write stuff, that i have allready written about 5 times in same project. Well, one of this "reiteration" are comments.
I write them in interface declaration, abstract class or base class declaration, and when i implement them, i must either copy them or write them again. Waste of time, if you ask me.
So, after reading some usefull links on my one of favorite blog, i tryed GhostDoc, developed from Roland Weigelt. It has exactly what i need, even more. One of very usefull thing is import / export. Create rules, configure it one time, export settings and then just import then anywhere you use Microsoft Visual Studio .NET.
I didnt try this on Microsoft Visual Studio .NET 2003 version, but in 2005 and 2008 works just fine. Bravo Ronald, nice work.
For usage, i recommend
this blog on O'Reilly's page.