Each time I implement an interface or override methods in a derived class, I have to copy XML documentation comments for methods and properties manually. This is quite annoying - especially for interfaces, considering the fact that VS.Net 2003 has this cool feature of creating the outline of an interface implementation automatically. So why not create the documentation comments as well?
Note that I don't want the original documentation referenced using some sort of complicated mechanism. Just Copy and Paste - in many cases the documentation should be tweaked anyway (at least if you want to write readable documentation; who doesn't hate those generic sentences describing "actions" that are "performed" on "items")
Man, this is something I really would like to see in a future version of VS.Net.