One example of joint actions between central banks during this period is the by now familiar US dollar Term Auction Facility, which started in December of last year, in which the ECB agreed with the US Federal Reserve to grant loans in dollars to euro area banks with a maturity of one month against collateral eligible for Eurosystem credit operations.
As you know, Eurosystem loans were financed through a currency arrangement (swap line) with the Federal Reserve, and granted at a fixed rate equal to the marginal rate of the simultaneous Federal Reserve tenders. The first two operations, for an amount of USD 10 billion each, were settled in December 2007 and renewed in January 2008.