Wikizzle is a project to AJAX-ize MediaWiki. It is a work in progress but sort-of works right now so long as you're using Firefox. Go ahead and try out Wikizzle on the Wikizzle wiki. If you want to see the latest at the cost of stability there are nightly automatic deploys from svn trunk and nightly source tarballs being made. Alternatively, you could use my wiki on the standard MediaWiki interface
I've got big changes planned. These should get written up on the wiki sometime soon. Is difficult, I have a job and an occasional non-geek life to tend.
Wikizzle is maintained by Jim Higson. Maybe you'd like to read my blog?