I've owned my iPod Touch now for just over a month, so I thought I'd put down some observations on this interface against traditional touchscreen interfaces.
I do like the multi-touch concept. However, one thing I've found is that the lack of a stylus or other pointing tool does make control choices less straightforward. What do I mean by this? I'll explain.
If I take the example of a palm application with a complex interface, like SoundPad by miniMusic.
The interface for this app is of course designed for a touchscreen device. The controls are to be used with a stylus and are small and can be quite close together. All of this is fine when working with a stylus.
However, imagine this interface, or something like it working on an iPhone / iPod Touch. It would need to be quite different or at least enhanced in some way in order to work effectively.
The same is true if you think of something like Bhajis Loops, or many other applications.
So, does this mean that we won't see apps with the kind of sophistication that the examples above have? Or, will developers need to think of new ways to tweak interfaces and utilise the additional possibilities afforded by the accelerometer?
I don't know, but I think it will be interesting to see what traditional Palm OS developers like miniMusic do when they start to release their iPhone apps.