Polishite: Website about Polish Culture and their old site, Polish Culture have some interesting information on the history and current culture of country from the perspective of Polish immigrants.
Polandian is a site written by an Irishman and two Englishman living in Poland. It's a little cynical at times, but has an interesting perspective.
Wikipedia has a short page on Roman Catholicism in Poland as well as general overview information on Religion in Poland and on Poland as Country.
Here are a variety of interesting BLOGS that all have something to offer.
Wroclaw Workshops: an alternative guide to Wroclaw and life in Poland.
Polish Housewife: Adventures of an American expat in Poznan.
Poland our Future: American couple living in Poland.
Do you Speak Polish?: An English teacher in Poland.