http://map1.squeakfoundation.org/sm/package/6805c4ca-6a33-4396-801a-b7ea1c3e3567

This is the first version I dare offer to the general audience. There's
quite a bit of cleanup work to do, but the storage format is stable, I
think, so if you like you can start fooling around with it. 

Note that this is more a 'toolkit' (or Seaside component) than a
ready-to-run wiki...

http://tai42.xs4all.nl/gardner has a running example (as long as it
stays up ;-))
-- 
Disclaimer: all Dutchmen are liars