Nocomments is a module containing a blueprint on how to add comments to any module, regardless if the module use sql or not.
The module itself is proof and all you have to do is to copy some files and folders to your module, make 4 name changes and voila, users can comment on your flash game module or whatever you have put into a module.
The file contain the source itself as a downloadable zip file, so feel free to add the module to your live site and let others download this brilliant hack, directly from your site.