* The [http://wiki.eclipse.org/Main_Page Eclipse project] uses Mediawiki for their wiki site
* [http://wiki.creativecommons.org/Main_Page Creative Commons]
* [http://fedoraproject.org/wiki/Special:Version Fedora Project wiki]
I've seen some other projects that have nice Mediawiki skins, but I never bothered to write them down. A quick search reveals several projects by Suse: