I wish I had some light sources on the close side of the car =\ just too dark..

<img src="http://paul.socaleuro.com/audi/gallery/warehouse/paul.jpg">
<img src="http://paul.socaleuro.com/audi/gallery/warehouse/paul_3.jpg">
<img src="http://paul.socaleuro.com/audi/gallery/warehouse/paul_6.jpg">
<img src="http://paul.socaleuro.com/audi/gallery/warehouse/paul_4.jpg">

i'd suggest a higher ISO ... maybe a fill flash... studio lighting =))

Maybe just a slave flash behind a diffuser to light up that side like you said. Otherwise, looks fine.

car. Came out nice....but it revealed someone in the drivers seat with a goofy look :) You can probaby remove him and still save the shot.

roof of the office area.

getting one next time.

I'm not sure how CS2's HDR feature works, but if you shot in raw, you could possibly create a couple versions of each pic with varying levels of exposure and process them in CS2. Like I said, I'm not sure how the tool works yet, but it might be worth looking into.

Aside from that, #3 and #4 are probably my picks. Not a fan of the angle in #1, and #2 had my tugging the scrollbar to go left...until I realized that's how you intended to compose it! :-P