This is truly an awesome feature and I’m really glad Lifehacker posted about it. This is honestly one of those things that make reading a bunch of websites worth it sometimes, as it just made my iPhone experience so much happier.
First, in Mobile Safari, just hold down the .com button for a second to see other domain options (namely .net, .edu, and .org). Second, when the keyboard has the @ symbol but no .com key, you can hold the ‘.’ (period) key to get the same domain shortcuts…