Just posted this in another thread: I have either a crack I never noticed from day one, or a really fine, straight, deep scratch that goes from the bottom up to the home button, almost vertically.
I can't say it's a scratch though, because being so deep, you think it'd also scratch the black gasket/boarder thing or the home button, but no. It's just the glass. I have a Best Skins Ever skin on the back, because I KNOW people that use it will set it down on things, but I will NOT cover that gorgeous display with anything.
I'll deal with the thing that's not on the screen. I don't have antenna issues, and am afraid to trade for one that does. I was told by an Apple Store employee that I could certainly trade it in because it looks like a crack, and he said they've had many factory-new iPhones with scratches / cracks... So... Hmm...