You can pretty clearly peg the turn in the euro last month to the pledges of the Eurozone, IMF and others to aid Eastern Europe, if needed. The move by the G-20 to bolster the IMF indirectly helps further insulate the euro by shifting the burden of bailing out CEE to the IMF as well as lessening the odds of a major systemic default from the east sinking the banks in Western Europe.
All in all, this is a big plus for the euro specifically and a the reflation trade more generally as emerging markets now have somewhere to turn (with the resources to do something about it) if they hit the financial rocks.
Sorry it took me so long to come to this rather obvious conclusion but I am genetically predisposed to assume that global summits never accomplish anything noteworthy…