Link to another talk from TED about Sixth Sense etc.
SixthSense is a wearable device with a projector and webcam that can interpret our hand gestures as we move around in our real world, and thus is able to provide real-time up to date and relevant information regarding whatever is in front of us right now.
SixthSense paves the way for profound interaction with our environment. Think "Minority Report" and then times by 100.
If you haven't seen this, watch the video.
I promise you will thank me.