The Polish Programmers is the one that I use. It is almost the same as the American qwerty, except the specific Polish letters are the RIGHT-ALT keyed versions of their regular letters.
there is a topic around here somewhere how to make your american keyboard be able to type all these different polish characters (if you XP.) i very rarely use it.
I think it's pretty much the same....you can have Polish fonts on your regular keyboard by adding a Polish keyboard in the language settings, and using the rught "alt" key to add accents to letters.