GhostDoc is a Visual Studio extension for developers who need to Generate XML Comments from source code using customizable templates, maintain clean and up-to-date documentation, produce help documentation in multiple formats, use intelligent source code Spell Checker in Visual Studio, and more.
GhostDoc also helps automating the generation of clean, helpful documentation of your clean code, building it, and packaging it up all without human intervention.
If you follow good naming conventions in your code, then you will get very decent results on the summary GhostDoc generates. When I see code that is not documented, it is as simple as hit Ctrl-Shift-D to have GhostDoc document it.