Global Post reports Spaniards are moving to Latin America to find work, as the unemployment rate in Spain is 25% and up to 50% for young Spaniards. It wouldn't surprise me if Portuguese are moving to Brazil as well.
The key in all these moves is going to a place where you already know the language. The Brits, Scots, and Irish have a variety of obvious places to go: Canada, the U.S., Australia, New Zealand, Singapore, and a few less obvious locales like South Africa, India, Hong Kong and Sri Lanka.
As the Islamization of Europe proceeds apace, I expect the U.S. will see the same sort of exodus from the U.K. that already happens from Ireland. I don't see this possibility being reflected in the demographic projections which show the U.S. becoming a majority non-white country in X years.