One of the holly grales of the display industry is to make a reflective display with high brightness, full color and video speeds. Electronic ink currently is black/white only with relative low speed (refresh rate). This article (source: Economist) reveals developments from a Candanian start up that is developing ‘P-Ink’, based on photonic crystals.
It would be nice if you can check out people at a party before (or even without) talking to them. How this works? This is described in the article Playing tag from the Economist’s Quarterly Technology Review. A Bluetooth enabled phone identifies a person and you get the personal information from social sites. Mobile web2.0.