One of the near-constants on the iPhone platform is the overall polish of the applications (with exceptions, of course). This isn’t inherent in the platform; Xcode will let you lay out anything you want, and there’s no legal mandate to make a beautiful app, but it’s just something people do. Call it craft?
So why it is that developers on other platforms, no matter how well-intended, just can’t get the subtleties of the UI, like the crowdedrightupagainsttheedge spacing on the login field here (left)? Just a few tweeks (right) and it breathes so much better on the screen.