Doug,
Asher completely stated my thoughts. Now I would look to recover some detail from the shadows, which would likely be quite easy with either a 1Ds3 or even(!?) an original 5D. But the moment is well caught and I wouldn't necessarily look to lighten the shadows so much as lift them slightly to give the impression of some detail.
I also like the use of the car door to frame the shot, but find the top left corner a bit distracting. I find these things can be awkward when shooting weddings as everything is 'live', but I might try adding a bit of vignetting to pull the corner down slightly.
I'm sure that they were happy.
Mike