OK, this thread reminded me of something I wanted to bring up Dave.
Sometimes, when people want to add images to an entry, a lot of times they enlarge one of the existing images and then add their images as a post/comment. They don't write anything so you can tell it was done in error. I have seen several of these now in the Photos Forum and in fact have even done one or two of them myself, out of habit I guess. Can you add some kind of disclaimer, perhaps in red, that states that they are adding an image to the comments section for this particular enlarged image and if they wish to add to the entry, they need to go back to it's main page?