I am working on bringing up a new Tikiwiki system to use as my company's internal groupware site. We have experimented with a number of other solutions that were more explicitly groupware, and not been very happy. Many of them seemed to be organized around protecting or hiding data, instead of sharing it. And we like the group calendar and the trackers.
I think that there seems to be a bug in PDF generation from wiki pages that have emdashes in them — pages like this.