While voice activation is a pretty useful feature, many folks have had frustrating experiences when the technology isn’t implemented well. So what alternatives are there? Well, EyeSight’s Natural User Interface might be a possible solution, as it uses the cell phone’s front camera to detect hand motions, allowing developers to write applications to support these gestures. An example would see users playing music, changing tracks, browsing photos or even fiddling with your GPS navigation software all just by waving your hand in front of the cell phone as if you’re performing a magic trick. Seems like a pretty useful bit of tech, and you can check out a video demonstration of it after the jump.