When I was about 15 years old and a fledgling "serious" photographer, I wanted to enlarge and crop one of my photos in a particular way. Unfortunately, in 1979 it was all but impossible to edit a photo unless you had your own darkroom and printing equipment. Fast-forward about 30 years, though, and photo editing is child's play. Cropping is an essential photo skill--for example, most of the monthly Hot Pic photo contest winners are cropped, to improve on the original composition. But have you ever taken the time to learn the Crop tool's secrets? This week, I have five things you should know about this unassuming little tool