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One idea I came across in Hong Kong was very simple.
A lot of taxis had a roof fitting that created a partial vacuum across the entire roof of the car. Essentially it was a plain aluminium item, with a small air inlet at the front and a much larger exhaust at the back, thus as the car moved forward the air just above the roof would be lower pressure than normal and hence cooler, thus the cabin would in turn be cooled. Drag was fairly minimal, mainly just the added frontal area.
Add to this to a solar powered fan to keep the air inside the car changing while parked, thus meaning the air temperature never gets silly, a chair bead thingy to keep air moving beneath you, and some reflective window tinting and it might all be enough.
Derek
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