I need to write a help file for a WinForms app in Visual Studio 2010. Ideally, I\'d like to use a tool that integrates with Visual Studio, rather than a totally separate too
Here are your options...
If you want Microsoft's documentation generator with VS integration:
Although, it appears that DocProject doesn't quite support VS2010 yet.
For the Non-MS solution there's GhostDoc, which does support VS 2010 integration and appears to be a better solution.
For options that don't integrate into Visual Studio: