As Jeffrey Sachs says in the FT this morning (and I know all the problems with Sachs):
The curtain has been pulled aside on the once secret world of tax havens, and the scale of abuse is nearly beyond reckoning. Week after week, Americans and Europeans worn down by budget austerity have learnt about the secret accounts of their politicians, tax evasion by leading companies and hot money destabilising the world economy. The darker truth is that these havens are not gaps in the world’s financial system; they are the system.
The world is now realising what Ronen Palan, Christian Chavagneux and I said in our 2010 book:
The world is catching up with that hypothesis now. And that's why action is needed.
The book is available here and elsewhere, of course.