Does Iceland even fulfill the entrance criteria?
Those Baltic nations keep setting a target date and they always miss it. If Estonia is still on track by September, they will probably be the next to join, but we'll see if that is the case.
Denmark sounds like a good pick to me.
The EU has already stated that they will allow Iceland to fast-track into the EU and join with Croatia in 2011. Whether Iceland meets inflation standards for Eurozone membership is a slightly different issue (and they might despite the collapse), but, given the EU's willingness to waive time limits for Iceland to accede as quickly as possible, they might be willing to waive inflation requirements, too.
Kosovo and Montenegro unilaterally took up the Euro and are not part of the Eurozone, formally.
