Michael Andrew (05.26.10, 9:02 PM): Full size typically gives you the best quality in terms of resolution.

Abraham (05.26.10, 8:53 PM): Michael, thanks for posting this info. I've always wondered. Does image quality degrade by shooting at the full resolution of a camera (i.e. @ 18 MP on the 7D) vs. shooting on the 7D at let's say Medium size?