There are plenty of good reasons for the dramatic rise in interest in printed electronics. Market research by IDTechEx suggests that the market for printed electronics, encompassing areas as diverse as transistors, RFID tags, photovoltaics and OLED displays, among others, accounted for $1.7 billion in sales in 2007, and may reach $300 billion in 20 years.     Even if one thinks that such an estimate is on the high side, consider that if the sales of printed electronics reach...