Słodki Całus od Buby - cool name:D it means sweet kiss from Buba.:P
Człowiek na Księżycu - great name:D I didn't heard it yet,gonna check. And their music is avaiable on last.fm:) it's not common for polish gruops to have tracks here.
J.Kaczmarski & Z.Lapinski - I know some their songs, maybe I will get to know more:)
Dikanda - never heard about. But not streamable yet...
W.Belon - I know him from Wolna Grupa Bukowina, but didn't hear his own songs.
there on dashboard main page, and od music section there it's also Tomek Fojgt & ENIGMA, Klaus Trzaska Band, Maciej Kossowski, Mariusz Wdowin, Piwnica pod Baranami and Krążek, and Anna Szałapak.