Poles, Slovaks, Filipinos?
And will they leave now that oil is crashing?
Plus Norway has some of the most generous welfare plans in Europe. I've heard that even the unemployed are treated to a one week paid vacation in spa towns and the like.
Interestingly, the Polish are the biggest foreign group in Iceland (settled by the Norsemen) for much the same reasons.
Plus, some of the most impressive Catholic cathedrals in the world were built by the Norsemen in Greenland when they were there 950-1430 or so. Yes, they are missing roofs now, but still extremely impressive when one considers the Norse community in Greenland was probably never more than 12,000 or so.