Ireland would have been able to pay its debts for the first half of 2011, but was pressured to accept the help from the EU and IMF. They're getting a 90 billion euro insurrance/loan, which is supposed to be paid back.
Next in the line-up of doom are Portugal and to a lesser extent Spain.
The Portuguese and Spanish economies are heavily intertwined, with Spanish banks having large stakes in Portugal.
Because investors are loosing faith in all these countries the EU is now (probably) pressuring Portugal into getting a loan, so that when Portugal gets help, maybe Spain won't need it. Spain is a much larger economy then Greece, Ireland or Portugal and so would be a huge problem for the Eurozone.
Italy doesn't get mentioned that often, but it's economy and debts aren't too healthy. In addition Belgium is coming into the picture as well even if its problems are by far not as big as the other countries. However it does have a big debt and has trouble forming a coalition government (which is always the case in Belgium) resulting in no new policy.
