@devu: on small items, particularly full-sized web pages, I would say the main difference is mobility. For a mobile device, it's only natural to have many use cases where the user is not confined to standing still or sitting down. For the effort and time that you spend manipulating the stylus (with both hands tied to this process) and trying to click something that I assume is on the edge/outside of the normal ergonomic envelope on a 3.5" screen; a finger-friendly interface can accomplish the same with one hand and an additional click or two. ie: on the iphone, you double tap on the areas that you need to zoom in and you can click on the intended button; all under 1s. all this can be done while your other hand is preoccupied with something else and the user not having to stop or sit down....