I checked most of them by my discussion page, or by some random edit
from the RC list:
http://encyklopedia.servis.pl/wiki/
http://www.eldamar.my.link.pl/encyklopedia/
http://www.wiki.brief-reklama.pl/
http://www.artemobili.com.pl/encyklopedia/
http://wiki.optymalizacja.com/wiki/
http://www.polsek.org.pl/Main_Page.pyw (all the links go to the Polish
Wikipedia, but anything you insert in the URL works)
http://www.ee.pw.edu.pl/~kochanor/wiki/ (not the Polish Wikipedia, but
other Polish projects)
--
Pozdrawiam,
Dariusz "Datrio" Siedlecki