How cool is that, very useful. Need more shortcuts like this!

Iphone 2.0: Domain Shortcut Helps Type URLs in Your iPhone More Quickly

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