I'm running a PC with vista and Ken is right, if you disable the "show content while dragging" option, this won't be seen. However, I'm assuming 99% of windows users havn't done this in which case they can see the ghosting. It's really not a big deal, and I may have to come to terms with it, but it just seems unprofessional and amatur. This can be seen in Explorer, Firefox, and Google Chrome to the extent of my knowlege.
This is the site I built for my friend, http://www.creaturerevenge.com/ It being the first css site I've ever built, its bound to generate criticism, but if you click/hold on ANY image and drag you will see the effect I am talking about. If you do the same for this site, you will just get a "cancel" icon. I'm just trying to figure out what is allowing for this difference.