One thing that I think would be amazing would be using gps and/or cell radio signals to do a very rough estimation of atmospheric conditions. Having done a bit

One thing that I think would be amazing would be using gps and/or cell radio signals to do a very rough estimation of atmospheric conditions. Having done a bit of research with in geodesy at MIT, I remember using Trimble GPS receivers to track continental drift but having to account for environmental (mostly atmospheric) effects adding noise to our GPS readings. With a bit of low level signals processing, I believe it'd be possible to make plausible weather readings based on the noise in GPS receivers, though having done little mobile development, I'm not sure whether the Android OS would allow such low level access to GPS chips (or if the chips themselves are precise enough for the noise to come from the signal rather than the chip itself).