I'm in the military and we use some programs that allow you to have an overlay that you can basically put a sticky on and make notes. I was thinking about all the advantages touch can give you in this case. It would be cool if you could have a transparent "whiteboard" overlay that you could draw on and share. This could be useful to draw on your own directions, notes, boundaries, or circle. It's just a thought. It would be something you could bounce around in development, maybe there are more uses. However, it may a limited audience type of thing, so my feelings won't be hurt if you through this one out.