There was a submission about this yesterday:

http://news.ycombinator.com/item?id=2892085

That links through to demonstration videos by Ward himself:

http://wardcunningham.github.com/

Comments over here - http://news.ycombinator.com/item?id=2895342 - suggest that some HN participants don't actually understand what a wiki really is, or its history.

Don't know why, but I find that a bit sad. A bit like not knowing about _why.