Livescribe has introduced the Livescribe 3 Smartpen ($150-200) for iPhone, iPad, and iPod touch. The pen uses Bluetooth and an Infrared camera to transfer handwritten notes from a piece of paper onto an iPad screen in real-time using the Livescribe+ app. It comes packed with flash memory and an ARM processor. Unusually, Livescribe 3 uses proprietary Livescribe Dot Paper for note taking, and requires you to buy additional paper after you’ve used…