Nice stuff Adam, the alternative perspective works very well.
As for the processing, it is subtle and appropriate until you get to the sky. The uneven blotches of blue turn me off straight away, now, don't read that as a complete show stopper however its just one thing that I find screams HDR and unatural HDR at that. I would look at reprocessing to take that into account, I assume your using photomatix, if that is the case ramping up the light smoothing will give you much better smoothing (der
) in the blue sky and the clouds.
other than that, i got nothign else. Top effort on the composition and hanging your head outta the window (although I would have been really impressed if it was the other side of teh car
)