Currently only use it to play around (so no link to any ikiwiki yet), but I really like it and I see it as a potential WML killer. It also reminds me to Blosxom somehow although I think it won't be a Blosxom killer. OTOH I know of people who moved from Blosxom to Ikiwiki as blogging engine. 
Probably will use it for some parts of my website revamp and for wikiizing my hnb note files.