In the past 2 weeks I've set up two new wikis. Trashwiki is a wiki about dumpster diving and anything else that's related to trash. There's already a tiny community, and I guess we'll soon have 100 articles. We did copy some stuff from Wikipedia to get started, but do feel free to remove the dry encyclopedic stuff.
After that I decided I needed some money. Or cash. So Cashwiki is a wiki about money. So far it's just me, and I copied a lot of GFDL and public domain stuff from other places.
All this got me to playing with OpenID on MediaWiki, which I also set up on my favorite hitchhiking website.