According to The Economic Times (India), an encyclical calling for closure of such tax havens is scheduled for release on March 18 by Pope Benedict XVI. The paper cites the office of the Archbishop of Mumbai:
“We expect the encyclical to be published on March 18. However, a formal release will happen on May 1, on the [...]

Pope Benedict XVI met Thursday with British Prime Minister Gordon Brown. At the center of the agenda, the global economic crisis.
From Catholic News Service:
Brown said that he and the pope spoke about “the importance of what we might call ‘the simple virtues’ being at the center not just of family life in our societies and [...]