This page exists in order to discuss the process for creating/structuring and maintaining the Help: namespace on MediaWiki.org, and in particular being able to export it in a form usable in other wikis. This is a proposed solution, and feedback is encouraged. There are no doubt other methods that we could use - please use the talk page to discuss alternatives, or create new pages if you want to lay out proposals in detail (rather than placing alternative solutions on the same page).
As it will still be a while before a robust export process is made available, you may want to investigate a method of mirroring the current help namespace. This is less flexible but is a good interim method of getting a help: namespace up and running.