A long time ago I asked if anyone would like an extension that would help users add links (with correct spelling and capitalization)... Well I finally made one. It is crude, and it needs work, but it is as far as I can go with what i know.
http://www.mediawiki.org/wiki/Extension:Link_Suggest
You can test it out here: http://risdpedia.net/index.php?title=Sandbox&action=edit Clicking on the "+ link" button will reveal a search box. Just type in there and it will give a floating list of articles containing what you searched for. Then selecting one will add it to the article with proper syntax.
I would love help to make this extension better. I do know of some problems. The added button in IE7 gets added to the beginning not h end of the buttons. (anyone know how to fix this?) IE wil lose track of your position when you select a link, so it will always place it at the beginning. Safari and FF do not have either of these issues.
Always working to make mediawiki easier for the non tech users, -Adam