One thing that may be helpful, especially if you have more than one camera body, is to set the camera to name each file something different from the standard DSC, or whatever it is. I have set one of my cameras to name all images taken with it starting with my first name's three letters, thus ALX_0001 etc. to instantly recognize BY FILE NAME ALONE if it is my image, and which camera it came from. Another camera body names its images ATH_0001 etc. and the third, a D90 won't let me change its filenames, but it is different too, anyway.