The exposure is down to the camera. The stability of the shot, in this case, was by pressing it against the railings seperating myself from the helicopter. It's quite obvious when you move slightly, so I just take the shot again.
If it's any consolation, I took a shot of those fantastic cars too and it was blurry and underexposed. It went straight into the bin.
Haha, I can picture exactly where that is on the strip, next to where they rent all those fantastic cars??! Tenacious D reference makes me laugh. How are you getting these exposures so good and pics so sharp in what appear to be hand-held shots?!