in out project theopenidea.org we're testing a couple of systems at the moment, one of which(and my personal favourite) is your TikiWiki, however, we've encountered the following problem.
Trying to 'discuss' a wiki page gives this error:
Warning: MYSQL error: DB Error: syntax error in query: update tiki_forums set hits=hits+1 where forumId= in /usr/local/psa/home/vhosts/theopenidea.org/httpdocs/tikiwiki/lib/tikilib.php on line 101
p.s. the wiki is at http://www.theopenidea.org/tikiwiki/ if anyone wants to test, and i can provide someone with admin privelidges if they'd like to check things over, the choices seem to be Plone or Tiki, and i'd love to be able to present a working Tiki.