A shimmy and a shake could be all it takes to launch apps in the future, that's if this latest patent application ever pans out. Filed back in October of 2011, the folks over at Google are looking to make accelerometers useful for more than just screen orientation. According to the claims, after a training phase where in this hypothetical program would associate specific application launches with geographic location data, your Pavlovian smartphone could then automate workflows and effectively anticipate your needs.
Essentially, you'd have a mobile device that would know what to run wherever you were, hinging upon how you hold it. At least, that's the schematic covered in this USPTO document. Will it ever see the light of day? Hard to tell. Mountain View's just a-brimming with those 20 percent time projects. More here.