I just started with TikiWiki. My first installation is (going to be) a "free for all" site. You can see what it looks like by clicking here. It's in Croatian language.
I'm also developing some modules and plugins.
Feel free to use them
They're also commited to CVS and will be available in version 1.8.
Ah, ah... I'm the 100th member of the Tikiwiki team