Hi.
There seems to be a problem with character encoding in (at least) the Polish Wikipedia database. At first I thought it was the problem with my script but phpMyAdmin and even shell mysql also shows weird characters.
See for example: SELECT page_title FROM page WHERE page_id = 2117937
Or a lot more here: http://toolserver.org/~eccenux/dna/index.php?D=2010-10-10
Regards, Nux.