Safari’s keyboard has a “.com” button at the bottom, making it quick and easy to enter the tail end of a Web address. Hold the “.com” button down, and a pop-up appears, making it easy to enter .net, .edu, .org, etc. There’s a similar feature on the keyboard associated with Mail, but it’s not as obvious.
If you’re composing an e-mail to a friend or associate—something like: “John: Check out iPhoneLife.com”—when you get to the end of “iPhoneLife” press and hold down on the period key. A pop-up will appear, allowing you to select .com or other common Web address suffixes.