My Mom brought up a good point — if someone sends a link to their photos that they posted on Kodak.com, then can she get them printed at Walgreens? I believe the answer is no — and I don’t believe you can download high-resolution photos off the Kodak site and then reupload them to Walgreens.
Would be great if everyone used one website that users could then get the photos printed where-ever they wanted. But the chances of everyone switching their ways to some new photo site as the defacto, are slim. And the chances of Kodak.com allowing you to print at Walgreens, or vice-versa, are even slimmer.