Super Macro mode is very impressive. You can actually see the pixels on an iPhone 4 screen, meaning you can actually magnify things too small to see. In Super Macro mode it zooms to 38 mm (normal macro remains at 24 mm), which I guess gives the largest magnification.
Ant carrying a huge crumb. This picture is especially impressive because besides being macro, the ant was moving very fast (maybe it was excited), so it reflects the camera's fast focusing and cycling.