From what I have learned from our Polish exchange students, the B in Zbigniew is heard, the Z preceding it buzzes, the G is hard, the IE goes like Yeh, and the W comes out as -ff. The Y in Namyslowski is a short "i" (like in "it") and goes almost unpronounced. The L has a dash through it, making it sound like an extremely thick one that has in fact become a W.
Bluerein spent some time in Warsawa, I expect he has more experience.
I have ripped an mp3 of an announcement of a live performance of Wroblewski with following players announced: Zbigniew Wegehaupt, Marek Blizinski, Andrzej Dabrowski, and Jan Ptaszyn Wroblewski.
The N in Blizinski has a ´ on it that makes it sound like the "ng" in song.
The A in Dabrowski has a little accent at the bottom, making it sound like "am," so it's Dambrofskee.
mitglied.lycos.de/couw/announcement.mp3