There may come a time when a generation of users views paper-based Post-It notes as relics of a bygone era, and it could happen sooner than you think. Microsoft has already taken a step in that direction by developing a protytpe ultra-lower power display that combines an e-ink screen with photovoltaic energy harvesting and Bluetooth LE wireless

Source: Hot Hardware – Microsoft Research Dips Its Pen In Solar Powered e-Ink Post-It Notes With Data From Your PC Or Smartphone