Cardinal Marc Ouellet...

...of Canada is the frontrunner for pope (at three-to-one odds) on both Paddy Power and Ladbrokes (as of this writing). In second place is Cardinal Peter Turkson of Ghana. Rounding out the field is:

3. Cardinal Francis Arinze of Nigeria
4. Archbishop Angelo Scola of Italy
5. Cardinal Leonardo Sandri of Argentina

I still don't see anything on Intrade.