Christine Lagarde and Kemal Dervis appear to be front-runners to replace Dominique Strauss-Kahn at the IMF. Good candidates, no doubt, but in my view the best choice (if he could be persuaded to do it) would be Stanley Fischer, ex-MIT, ex-IMF, ex-World Bank and currently governor of the Bank of Israel. His performance in each role has been outstanding. I agree with Greg Mankiw's assessment:
Stan is a superb economist and international policymaker: smart, sensible, experienced, personable, and open-minded. He would be an ideal person to head the IMF.