I have developed my own WikiWiki clone called PikiePikie, written in Python, and based on PikiPiki.
You can find the current status of this project at http://pikie.dyndns.org/, and the latest version is available for download from http://pikie.dyndns.org/cgi/pikie.py?DownloadPage.
I can also be reached at mailto:steve.pike@oztourer.nl