Attached Link: http://www.debevec.org/Probes/

Actually, its a lot easier than you might think! It's just a matter of finding a good HDRI file. The one I used for this image came from THIS website (they're FREE). I then loaded in the car and the DAZ cyclorama background from Poser. To give the car some nice high-lights I added two spotlights on the camera side of the car-- and Voila! --INSTANT 1971 Magazine Car Ad!