I’d noticed a while back that if you hold down a key on the iPhone keyboard, such as the ‘E’, for a second or two, you get a pop-up menu with variations on the ‘E’ theme, like ‘é’, ‘è’, ‘ê’, and so on.
But what I hadn’t noticed until just now is that the “.com” key, which appears when you’re expected to type in a URL, exhibits the same behavior: if you hold it down, you get a popup menu with “.net”, “.edu”, “.org”, and “.com”.
In addition, since I have the French keyboard installed, the popup contains “.fr”.
In the email application, when you’re entering an address, there’s no “.com” button, just a “.” (period) button. However, it also has the domain popup, with the same TLDs as the “.com” button.
I’ve gotta say: it’s little touches like this that help the interface get the hell out of the way of whatever it is you’re trying to do.