Mark Pesce pretty much nails the entire issue with his post entitled iPhail. I'd be interested in picking up an iPhone in a month or two, once the hysteria has died down a little, but as Mark points out, it's basically a FestivalOfReam on 3G data plans in Australia. What I would almost certainly do initially is forgo a data plan at all. With WiFi, I'd have network access at home, at work, and in parts of the city via Internode. I'm not sure I'd be in desperate need of much more than that.