Originally posted by alohadave Learn to compose in camera for the cropping you plan to use.
Originally posted by alohadave Besides that, I don't preemptively crop anything until I've decided that I'm going to print it.
Originally posted by Marc Sabatella Whatever editing you do, you should always keep a copy of the original.
The above is pratically all that needs to be said on the subject.
I always keep a copy in the original format, and if/when I decide to print, I save a cropped version for the target format (with, eg. "-8x10") added to the filename.
And when in doubt about the format you'll want to print a given scene, frame wider than you would normally. You can alway re-crop to 3:2 later. This part I still have trouble with, and get bad surprises when I want to crop to 5x7 or 8x10...