3G iPhone - how much will it cost to own?

The world, or at least the iphone-aholics, is abuzz with the launch of Apple's new 3G iPhone. It looks good and can all kinds if fancy things, but how much will it cost to own and, more importantly, operate one?

Our former guest speaker, P.K. Chan and his team at Editgrid, have compiled an online spreadsheet that answers the above question. You can play with the data in the iframe below: