There is always a start, so that's the one. Wordpress is versatile enough and Barry is already using it, so this gives us a common web platform to use.Can't we all just get along on one well-organized site with one registration process etc?
The look is easy to change. Perhaps browse "wordpress templates" and run a thread to vote on a choice template.
The wiki should be fine, but users now want an easy GUI. And the phpfusion CMS (in pupylinux.org) has no maintainer now - it's "badbehavior" anti-spam is now misbehaving and preventing admin access.
Klu9 has done a lot of work in the Wiki, so his opinion on this matter is welcome. If you feel there are other alternatives, please don't hesitate to start a new topic.