I’ve had my iPhone now for almost exactly nine months. I’ve carried it without a case this whole time, either in my pocket or in my purse. I don’t use any kind of skin or screen protector with it, and I have not made any particular effort to keep it away from change or keys or anything else. It has fallen twice onto subway platform cement from about four feet up, it has had three cocktails and one beer spilled on it, and it has been sat upon once. I think the cat knocked it off my desk once or twice, as well.
The damage? Essentially none. There isn’t a single mark on the touchscreen itself, not even a nick. On one of the side edges, there is the smallest of scratches, which I blame on the first subway platform incident. One of the cocktails left the Home button slightly sticky for a day or two; it has been fine since then. Really, the durability of the thing has far exceeded my expectations, particularly given how battered my iPods became after a few months of heavy use. All in all, I’m about has happy with it as I could be.