I installed and setup MediaWiki(the wiki system used by Wikipedia) this weekend on my Linux server for a local non-profit (I’ll publish the URL when it’s live) and I have to say this was one of the easiest installs and setups that I’ve seen for a long time. I’ve installed a number of other open source CMS/Wiki type systems in the past, and MediaWiki really stands out as the cream of the crop in terms of ease of use and installation.