See this .
For all the talk about how this shows that the Euro was ill-advised, I tend to think the real problem is that Jean-Claude Trichet is an idiot, and that's the whole of it.
Europe still hasn't even lowered their key interest rate to zero. Just like Bernanke here, the ECB has continually "guessed wrong" and had monetary policy which is, in retrospect (as it was in real time), clearly too tight. Even now the key rate isn't even zero. One novel way they may help to avoid an Irish default is to lower their key interest rates! Had they done this two years ago, there may not have been any solvency problem in the first place.
It's hard to know why exactly officials from Berlin to Tokyo have been so enraged over QE2, but one thing it suggests that these are people who don't know which way is up.