http://www.undercurrent.org/UCnow/dive_mag...ater201007.html
Although I originally tried this in the benign waters off Florida, I got myself one of these for a trip to Kri Island and enjoyed the fact that I could motor into anything less than a 3knot current while being hands-free to hold my camera. I have the leisure version on loan and recommend it to anyone diving where there are strong currents. It isn't that expensive and weighs IIRC 8kg at check-in.