The most important thing in mobile creativity for me is getting the technology into the background. If I want to share a photo that I've just taken with people around me or add text to the photo and e-mail it / tweet it / flickr it, I don't want to fuss with the technology. All the heavy lifting needs to happen very quietly in the background.

I really think a touch-based sketch pad is overdue for the tablets. It needs to be both vector and bitmap, and it needs to be both finger and stylus friendly, depending on what you've got and what you want. It needs to handle photographs, and it should be able to handle stuff pulled from various places -- text documents, web pages, etc. It should let you overlay all of these things and add your own drawings, notes, etc.

Liqbase comes close, and mypaint comes close, but liqbase only does vector strokes, and mypaint was too clumsy to use (as well as having too many bugs).

Andy80's ideas really intrigue me. Mesh networking, real-time sharing with those around you, geotagging, etc... I'm so impatient. I want those things now, I don't want to sit around talking about them...