OK, so I just got off the phone with Apple tech support...He immediately said that the picture displayed was from Apple and that he had seen it before regarding this issue. I also mentioned how it appeared to be a screen defect, and that it didn't affect 12 or 17 in models. I also told him about how people were getting screen replacements done, only to get back a bad PB with the same LCD part number. He proceeded to tell me that they actually have a new LCD with a different part number to fix this problem. I was less than convinced, obviously, it sounded too good to be true. However, I reluctantly agreeded to a "looper" repair to give the replacement another shot. I got his extension number and he said to call if it came back the same.
The only thing that encouraged me (unless he was flat out lying), was that he immediately recognized the pic online and told me it was, in fact, a defect, albiet only in a "small percentage of Powerbooks". I didn't know how to take it, because after reading this forum, one might believe it affected every new PB.
Nevertheless, it is getting sent back in, so I'll keep everyone posted. At the very least, I've gotten myself one step closer to a refund, or 17 inch replacement...