Fathom this!

Wikis tend to fall into the same layout/design pit as many open source CMS systems: they all look drab and alike. Usability-wise this could, of course, be considered somewhat beneficial. However, the feature-driven functionality of these prototypical designs aren’t actually all that easy or obvious in the first place, so this doesn’t come near compensating their drawbacks. This is why I was quite impressed with what Wetpaint has done with their wiki templates.