The side-by-side hover-loupe (under "In a word, resolutionary") is very very good at demonstrating the difference. The loupe uses the image below. You can open

The side-by-side hover-loupe (under "In a word, resolutionary") is very very good at demonstrating the difference. The loupe uses the image below. You can open them and verify that no cheating has been used. The 3GS image has 2*2 pixel blocks all over. The images don't have subpixel antialiasing (as they have to be viewable on all kinds of monitors), so I expect them to look a tiny bit better IRL. iPhone 3GS: http://images.apple.com/iphone/features/images/retina-resolution-3gs-20100607.jpg http://images.apple.com/iphone/features/images/retina-resolu... iPhone 4: http://images.apple.com/iphone/features/images/retina-resolution-4-20100607.jpg http://images.apple.com/iphone/features/images/retina-resolu... Try view the images. A truly great difference.