my dad and i were talking about product photography, and he told me of this technique he used sometimes. he says he set up his camera and subject in a completely dark room. he set his shutter speed to maybe 1-2 secs. while the picture was being taken, he "washed" the photo with a light source. he says it eliminated shadows. have you heard of this technique before? i'm going to give it a go sometime and post my results.