Different colored touch-buttons?
I doubt this is anything of consequence, more than variation in products, but I figured I'd mention it anyways.
I was looking at my friends Droid, and I noticed that the touch sensitive buttons are a slightly different color. Nothing terribly noticeable, but her keys were slightly more purple in color.
They were still white, and the difference was so barely noticeable that even when I tried to take a photo in a dark room, they both appeared more or less white in the picture. But there was still a variation in color temperature.
My phone is a 42/09, and hers is 46/09.