londrum - 4:59 pm on May 18, 2010 (gmt 0)
different countries have probably got different splits anyway, so the italian info wont help all that much.
adsense has got more competition in the US than it has in europe, so US publishers probably get a better deal.
you probably get a different split for different niches as well. if there's only one program advertising red widgets then they've got you over a barrel, and you're probably going to get a worse cut than one like books, which has bazillions of different affiliate programs.