In order to limit access for specific pages on
MediaWiki (e.g. for developing internal ideas etc.) you might find
this add-on to MediaWiki interesting. It add a 'restrict' functionality to each article, similar to the 'protect' mechanism. Its access control is not very fancy (if you are in a group called 'restrict' you can view and edit all restricted pages), but it is useful in general.
Tags:
MediaWiki