Just to make this discussion complete - the elections were won by Citizen Platform, though they did not manage to get enough votes to form a government alone. They are currently discussing a coalition with Polish Peasant Party (PSL).
PSL is a rather interesting party. First of all, this is the oldest party currently participating in Polish political life - its roots go back as far as 100 years. This is very unique to Polish political scene, where most of the parties didn't exist 6 years ago. Moreover, even though it is called Peasant Party, it has the highest number of people with high education, even above PhD level. Their leader - Waldemar Pawlak, is supposed to be a very demanding coalition partner for Donald Tusk (PO leader). Yet, so far they seem to go well in their agreements.
As far as you might remember - current Polish president is still from Law and Justice party (PiS) which was the major competitor for PO in current elections. It lead to some really wired situations already, as Polish president seems to have taken offense with PO at them winning the elections...
So all in all, we do live in interesting times.
As a bonus - exact results for Polish elections. They are in Polish language, but in graphical form, so its easy to understand them. The parties are - Citizen Platform (PO), Law and Justice (PiS), The Left and Democrates (LiD), Polish Peasant Party (PSL), Self-defense Party (Samoobrona), Polish Families League (LPR) and Polish Labour Party (PPP). The chart to the very right shows number of parliament members and senate members.
http://www.tvn24.pl/wieczor_wyborczy.html