I think that it's bizarre that no one has mentioned the problem associated with cell phone radiation. And before one all too quickly dismisses this issue because it's not convenient to think such thoughts, just keep this in mind: what good is microwave radiation doing to those biological cells in your head and groin? If iPods (or any MP3 player for that matter) were to converge with cell phones the manufacturer's of such products would lose my (and my family's) custom for good.
Bill Gates is Right, and Wrong About The iPod