We already knew the iPhone is Apple's number one revenue generator, but it doesn't help us visualize how big it really is until you compare it to something else. As a matter of fact, it is so big that comparing iPhone revenue to other companies' business units wouldn't paint a good picture. In order to really see how big of a business the iPhone is, you have to compare it to full size companies.
That's what the folks at Business Week did. So how big is iPhone compared to Microsoft, Nike or Coca Cola?