I installed wikipgdia for the WPLUG wiki:
http://wplug.ece.cmu.edu/wiki/
Isn't that the same wikipgedia that is found at pgFoundry? The only issue I really had the the wikipgedia port is that the codebase is 1.6alpha, and it seemed like it wasn't being actively maintained anymore (infact that is what the description says), so I am not sure it has all of the bug fixes up to 1.6.10.
In any case if anyone is interested I was able to reproduce the changes that wikipgedia made and applied those changes (as well as others) all the way up to the 1.6.10 codebase. The only reason I mention this is because 1.6 is the only choice for PHP4 users. If anyone is interested I can provide the codebase, the schema still has to be created manually as was the case with wikipgedia.