There's a lot of good information here, but I felt that the introduction to the Polish section was very slanted. Deborah Lipstadt, the Holocaust scholar, has a blog entitled "The Myth that won't die: the Poles were worse than the Nazis," and this intro perpetuates that myth. Most scholars agree that the Poles collaborated less with the Nazis and resisted them more than just about any other occupied country (Yugoslavia had a huge resistance too). Pre-war anti-Semitism and post-war anti-Semitism are irrelevant to this fact, and are complex issues (certainly anti-Semitism was encouraged by a Soviet government hated by most Poles).
Bottom line: the Poles hated the Germans. So in Poland there was no central government collaborating with them. This makes a difference. The Hungarian collaborating govt turned over 600,000 Jews for extermination, with all of 13 SS men to oversee. The Vichy govt rounded up 14,000 Jews in one day, throwing in 2,500 children whom the Nazis didn't ask for, without a German uniform in sight. No Polish SS battalions: there were volunteer SS battalions from all over Europe. No Polish concentration camp guards; no Hiwis (helpers of the mobile killing troops). Picture a collaborator with a uniform and a gun killing a Jew. That could've been one of many nationality, but almost certainly not Polish. (Some Blue Police and local police collaboration excepted, but minimal in the scope of the Holocaust.) Why did the Germans bring in tens of thousands of Ukrainians and Balts to run the machinery of the Holocaust if the Poles were so bad?
Did Poles collaborate? Yes. There were plenty of scumbags who helped Nazis find the Jews hiding out, after the ghettoes had already been emptied. There are scumbags in every society. This caused genuine damage, but really, in the scope of the continent-wide betrayal of the Jews and collaboration with the Nazis, it's certainly doesn't give a reason to single out the Poles. The intro seems to rationalize Jewish "rage" against the Poles. Personally, I don't believe different ethnicities have specific moral qualities. I think it's an individual thing.