If an iPad is Apple’s post-PC platform of choice, it will have to be capable of completing tasks of every type. Certain activities, such as photo and video manipulation, are well-suited to the iPad’s fluid UI and direct interaction methods.
Other areas are something of a different story. For example, there is still no outstanding way to manipulate, organize, and share numerical data. The simplistic extreme of this is something like Calcbot, which makes it easy to do rather trivial mathematical operations, and then copy those to the clipboard to share via iOS’ built-in copy/paste functionality.