I like the idea. I see it.
I question the "pad" as a delivery tool.
How do you picture yourself using this?
Are you sitting or standing?
Sitting…hmm probably not, but still, just for the hell of it, sitting…
is it on a flat surface or not… well.. the reflection of the light above your head means that it needs to be inclined, with one hand behind to hold, one hand to operate. Without trying to be comical, if we are sitting, we end up with a laptop with a modification (pie of books ?) to stop the screen from moving.
Standing…
Ok, how long is this presentation ? 30 mins ? It is going to get heavy.
Ok, so you will put it down somewhere when you are not using it. Good plan, but somehow this is going to break the fluidity of the presentation. Anyhow, let's assume you do that and you eliminate the weight aspect or holding a 1.5 lb item between your thumb and fingers, horizontally so it does not slip from your sweaty palm.
How are you going to hold this ? By the top, the bottom? where is your thumb going to be, on the multi touch screen ?
It really does sound as if you need a stand for this device. One that will hold the screen at around 15 degrees off the vertical. A laptop on a stool will do that.
I like the idea though. I also think that Prezi is pretty much there with the software concept.