I don’t have any concrete ideas to impart in today’s Obsessions (I’m sure you’re crushed.) In lieu of a real thought, maybe some of the things I’ve been researching will interest you.
The assumption is that you will always have your mobile device in a pocket, so the program utilizes the Bluetooth signal from that device to alert your larger machine when you’re moving towards and away from it. This in effect turns you into part of a lock and key system, one which I find ingenious. Not only is it based upon proximity, it’s also subtly and inherently based upon form factor: It knows your mobile device is small enough to essentially become part of your physical person for the purposes of the action.
Aaaaaaaaaaaaaand finally, in the shifting of the paradigms, here’s a very interesting open letter from Scottish developer Matt Gemmell, on how to compete with the iPad. It deals with developing business models and how not to be a complete and total whiner while your lunch money is being stolen by other platforms.