In addition to other things I enjoy fiction writing, songwriting and graphic arts. Ideas occur at the craziest times and places and I need to capture them... so voice recording (and best of all recognition) is a big one for me, as well as the ability to capture and annotate images as well as create them on the fly from scratch. As qole noted liqbase is growing into an extremely useful app so that's a start... but I'm seeing potential with Maemo devices as handheld creativity boxes for writers and artists.

Then there are applications such as the OSM2Go for editing OpenStreetMaps. The ability to update, refine and add value to a commons mapping solution is powerful, and could be one of the killer apps that creates buzz around the platform. In fact it's that on-the-go heavy computing power in your hand that makes the devices so compelling in the first place-- all potential users need are hard, clear use cases such as we are discussing.

And then there's augmented reality...