Document Generator for .NET Class Libraries
A new MSDN-like document generator, code-named "Sandcastle" is available (in CTP) from Microsoft. It is said to be working with and without XML-based document comments and generates HTML Help-based help file. I am planning to give it a try this week-end!
Download it from http://www.microsoft.com/downloads/details.aspx?FamilyID=E82EA71D-DA89-42EE-A715-696E3A4873B2&displaylang=en