yeh ive seen that on TV. it seems ANZ have gone about cutting the load speeds of the iPhone's 3G connection to fit on a 30 second commercial instead of going to Apple way of showing insane and unrealistic speeds.
is it an app or just a shortcut icon to ANZ's mobile page?
just read this article its just a web clip icon shortcut to ANZ's website which detects whether an iPhone is being used and then loads the mobile version of the website.