Pito's Blog: [OOPSLA] Where Wikis come from: "I was lucky enough to meet and spend some time with Ward Cunningham at OOPSLA this year. I also heard him present in a big hall. If you are a Wiki fan then you know that Ward is the one who invented the concept.
What seems to be a little less well known is how the idea evolved, where it came from. I am sure it's written up somewhere. but I thought I'd write down my own idiosynchratic understanding of the story."
Read the entire post -- great summary.