I gather JotSpot has some good features, but if I were using a wiki to manage mission-critical information (particularly if said mission had anything to do with the internet or computers), I'd be hesitant to have it hosted on somebody else's server (particularly Google's). If I need a structured wiki (not a Mediawiki-esque free-for-all), I go with TWiki, despite its clunkiness.
Here is a link to a comparison of sorts, if anyone is interested:
http://twiki.org/cgi-bin/view/Codev/JotSpot