In the category of smart gadgets comes the Airpen Pocket, a product made by Pentel that represents an upgrade to their previous digital pen models: it has a memory unit.
You can display information on the screen in the same time you write, or you can save it and put it on a computer or smartphone, by simply pressing a button or using USB connection. It supports Windows and Mac (requires a free Android application for smartphones) and comes in blue and green. Highly recommended for any kind of designers.
Buy it from JapanTrendShop, at $287.