With a little inspiration from Hitwise, I had a look at quick look at the trends for large Polish websites in Google trends, but searches from Irish IP addresses.
As you would expect, this trend has a southward feel to it as many return home again.
The largest of these sites being visited form Ireland was www.nasza-klasa.pl
, the largest polish social networking site, keeping you in touch with friends both home and abroad. From a high of 20k daily visitors in July 2008 to half that now it really shows the rate of decline the speed at which people decided to leave.