Hi, I work for Aptivate - www.aptivate.org - a UK-based non-profit developing IT solutions for the international development industry.
We are a LONG time user of wikis, our main intranet is jspwiki and is now 10 years old and has everything about our company's history - of course you can never find anything, but that's not the point!
I stumbled across Wagn as I needed a content-heavy collaboration tool for a short project I'm working on in Pakistan. I have fallen in love. Wagn seems to be a great middle between old-school wiki and full CMS. I'm a very happy bunny. Hoping to contribute to documentation where possible. I'm just learning rails (we're heavily into django at Aptivate) but fingers crossed I may also be able to contribute to the code.