My name is Neil Richards, and I'm a big fan of Mediawiki.
I've heavily skinned mediawiki using the monobook skin as a template, and have made some the following contributions to the community:
- Extension:StyleTags >> embed style tags within Mediawiki
- Extension_talk:AutoLink >> Amended this so that it was more performant, and have resolved several usability issues
knowledgethoughts.com/blog will see a similar skin done for wordpress.