Recommended sites / useful links:

www.isztar.mf.gov.pl - Browse ISZTAR
www.ec.europa.eu - Browse TARIC (Polish)  
www.pisil.pl - Polish General Forwarding Rules - PGFR 2010
www.eksporter.gov.pl - Ministry of Economy - Export Promotion Portal
www.kig.pl - National Chamber of Commerce
www.mf.gov.pl - Customs
www.transport.gov.pl - Ministry of Transport