Once someone has an iPhone, it is going to be tough to persuade them that they also need to spend money on and carry around a dedicated GPS device, point-and-shoot camera, or tape recorder unless they have an unusual need. But the real problem for other device manufacturers is that all of these iPhone features — particularly the always-on internet connectivity; the email, HTTP, and SMS capabilities; and the GPS/location features — can work in concert with each other to actually make better versions of the devices listed above. Like a GPS that automatically takes photos of where you are and posts them to a Flickr gallery or a video camera that’ll email videos to your mom or a portable gaming machine with access to thousands of free games over your mobile’s phone network.