Make this happen by mirroring the standard Konami sequence (up, up, down, down, left, right, left, right) using swipes instead of touching command keys. When you get to the BA sequence, a controller will appear on-screen to let you tap the B-button and then the A-button.
As for the Konami-compatible websites listed, they are not as forgiving, I'm afraid. The iPhone compatibility does not extend to any of the listed pages that I tested. Given that we have fully entered the age of iPhone OS (and soon, the tablet), I think you can expect touchKonami to start expanding to ever new sites and applications. For example, Polish Demon's Emojinabler app (currently in App Store review) uses the sequence to unlock Emoji text access on non-Japanese iPhones.
Know of a touchKonami-enabled website or App Store app? Let us know in the comments.