Does anyone know of a good, brief overview of the Eurozone crisis written by an expert?

The only thing the ECB is restricted from doing by Treaty is buying bonds directly from Italy or Spain. It’s allowed to buy bonds on the secondary market from everyone else. In fact it’s already done so for Italy, it just didn’t buy very many of them. What economists like Krugman want to see happen is for the ECB to announce that it will start buying, and continue to buy, Italian bonds until its interest rate stabilizes - ie. they want it to promise to act as the “lender of last resort”. That’s something that just needs an agreement on a table corner in the middle of the night.