You guys don't seem to understand this at all. I think you are confused - it has nothing at all to do with whether you are in the northern or southern hemisphere. I can't believe that professional aviators would think that!!!!
Icarus - It is all to do with whether the aircraft is flying in a cyclone or an anti-cyclone. If you are flying in an anti-cylone, the blades have to oppose the air-flow due to the pressure system - thus rotate anti-clockwise when viewed from above. In a cyclone the reverse is true.
As far as I know - helicopters don't fly in the southern hemisphere.
LC - finally hoping to clarify this nonsence!!!