Well, Microsoft has just released SandCastle which is their official tool to do the same thing. The guy who has worked on NDoc free of charge all these years is a little bitter about it:
Since 1.3 was released, there have been the grand total of eleven donations to the project. In fact, were it not for Oleg Tkachenko’s kind donation of a MS MVP MSDN subscription, I would not even have a copy of VS2005 to work with!
[…] Once “Sandcastle” is released, it is my belief that it will become the de-facto standard and that NDoc will slowly become a stagnant side-water. This will happen regardless of technical considerations, even if Sandcastle were to be less feature-complete. It’s just an inevitable result of MS’s ‘not-invented-here’ mentality, one only has to look at Nant and NUnit to see the effects of MS ‘competition’.
I can’t blame him, really.