Expat.com is a worldwide directory of blogs related to expatriate life, with listings for Poland.
Expat Focus provides information and resources for expatriates for a large number of countries, including Poland. The website also host forums and blogs for expats.
PolishForums.com is an online community about everything in Poland.
Polish Tourism Organization is a travel portal by the Polish National Tourism Office with basic information to help you plan a trip to the country.
Lonely Planet Worldguide provides a lot of useful travel information on its website, including Poland.