Greece was first. I think Portugal or Ireland will be next, then Spain and Italy. The problem is that as the dominos fall, it makes things harder for other European contries (as they all contribute to rescue packages).
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But no dominos will be allowed to fall.
As soon as Portugal gets in trouble the ECB will step in and will buy their bonds.
IMO the fire will be put out more quickly than people think.
Don't forget that the EU and the US are not happy with the credit rating agencies so they'll do something about it.
Tim Geithner, US Treasury secretary, and Hank Paulson, his predecessor, joined the attack of the ratings agencies, telling a US inquiry into the causes of the financial crisis that ratings agencies were part of the problem and that their influence should be clipped. They were a “dangerous crutch” for markets, said Mr Paulson.
“I don’t want the ratings agencies to be held up as the font of all truth and have the ratings be part of our securities laws,” he told the inquiry.
http://www.ft.com/cms/s/0/a47745ec-5959-11df-99ba-00144feab49a.html