If you're looking for a tiny, quick Perl Wiki engine, look no further than Oddmuse!
Under active development for at least a decade, with thousands of instances up all over the intertubes, the 4000-line core can be extended with hundreds of modules, and writing your own is easy!
There are also a hundred CSS skins available to make your wiki's look fit its function.
If you have questions, join #oddmuse on Freenode; there are n00bs ready to learn and aulde-timers alike ready to talk wiki!
Google up Oddmuse and have your own wiki running minutes later.... or just click here!