I suspect this is old news for many but for the ISV I met just before my holiday it was new - hence I felt I should share more widely. In brief - NDoc was awesome for producing MSDN style documentation for your code - but didn't work with .NET Framework 2.0 code. Along came Sandcastle to the rescue - a solution which we were using internally to generate documentation which we have made available as a number of public CTPs - the latest being the March CTP. Find out more at the Sandcastle Blog and Wiki.