What are the iPhone App icon sizes?

In case you’re looking for these, here are the sizes of the custom iPhone App icons:

Home screen icon: 57 x 57
Settings icon: 29 x 29
Loading image (size of window): 320 x 480
Tool bar, Nav bar icons: 20 x 20
Tab bar icons: 30 x 30

Want to learn more? iPhone Human Interface Guidelines: Creating Custom Icons and Images.