I briefly tried one of the two Wiki packages they have available for installation, TikiWiki. I really didn't much care for it. Too confusing to set up and use. Lots of features, though; maybe if I wanted a CMS that might be the way to go.
Haven't tried PhpWiki, the other easy alternative.
More likely I will end up using MediaWiki (the standard, used by Wikipedia and the Poker Wiki) or Twiki (which is what I use at work.) But I need to request shell access to set either of them up (though the web hosting online help explains exactly how to set up MediaWiki.)