The Square card reader is an amazing device. I do wish my Android phone had the equivalent of a dock connector to allow higher powered accessories, but barring

The Square card reader is an amazing device. I do wish my Android phone had the equivalent of a dock connector to allow higher powered accessories, but barring that I'm really excited about the potential of using the phone's audio jack for power and signalling. This one's been linked on HN before, but if anyone hasn't seen it: http://arstechnica.com/apple/news/2011/01/project-hijack-uses-iphone-audio-jack-to-make-cheap-sensors.ars http://arstechnica.com/apple/news/2011/01/project-hijack-use...