I would like to propose the following:
That any new image uploads should be required to give a source for the image (be it a URL, book or photographers name). Failure to provide a source should make an image a candidate for speedy deletion.
The motivation behind this is that there are far too many images where we have absolutely no information about where they came from. This makes doing copyright research into them a lot harder. Even in cases where it is stated that an image is PD, without a source there is no way to verify if this is indeed the case (or to find out if PD status only exists in certain juristictions).
Imran