I'm sure i will forget about at least few important albums but i'm gonna try;p
Here are the polish ones:
http://img.mp3sugar.com/album/cover7437_53384.jpg
Kult - Spokojnie - 1988:
I think it's the best of kult/kazik/knz etc ever made. It's not heavy at all and got a few really kickass songs. Highlights: whole fuckin album (re-release version with Czarne Słońca owns even more than original).
http://www.vivid.pl/okladki/13007000/13007780.jpg
Kaliber 44 - Księga tajemnicza. Prolog - 1996:
I'd not lie if i said that this i probably the most 'kvlt' polish hip-hop/rap release. Seriously flawless, excellent lyrics, beats made with amiga afair and 3 of like 5-6 best polish mc's. As called - psychorap - it's not a kind of yo nigga sup im gonna shot you with my gun etc ;p
http://www.pfk.one.pl/dyskografia/paktofonika_kinematografia.jpg
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