I've recently discovered Tiki. Wow, it's pretty amazing. Time too learn some php . I've started migrating to Tiki from TWiki and Zope. Before those, I used usemodwiki for a while.
I'll mostly be using Tiki as a family site, but I'm also thinking of using it in some business settings. We'll see what happens.
Anyway, go check out my Tiki site at CastleMurphy.