https://github.com/OSAS/strapping-mediawiki looks pretty awesome! (Example at http://www.ovirt.org/Home). This also makes bootstrap's classes / layouting helpers available to content inside the wiki itself, which is pretty cool.

Perhpas we could build an experimental Mediawiki site for some sort of crowdsourcing project, and make it look amazingly great? (With Bootstrap)

(thanks to Patrick Reilly on IRC)