Editors' take: We've already glimpsed how one app developer was able to turn his miniature DJ turntable iPhone app into a realistic, life-size audio mixer for the iPad. In a similar example, app developer Melvin Rivera shares a handful of final screenshots of his piano training app Nota, reconfigured for the iPad.
Arguably, piano and DJ apps aren't likely to be primary uses for the iPad, but both of these early examples illustrate how a change in screen size means much more than larger images. In both examples, we would make the case that the difference between the original iPhone app and its iPad counterpart is a difference between novelty and practicality.
Of course, piano and DJ apps are both examples of apps trying to graphically represent and replace actual objects in the real world. It makes sense that larger screens do a better job representing life-size objects.