gotcha writes:  

Nuke Docs is a module designed to make writing structured documentation as easy as possible.
Pages are arranged in a hierarchal fashion with the ability to have unlimited chapers and sub-chapters.
Administration is done completely from within the module so pages can be added, edited, de-activated, or deleted on the fly.

You can see a screenshot and download Nuke Docs in the nukecoder.com downloads
You can also see it in action HERE

Please note that this is a beta release and it can potentially contain bugs. If you find any bugs or have ideas for more features, please post in the nukecoder.com forums.Note:
Please note that there is also a version for RavenNuke(tm) :)