Georgia Institute of Technology is working on printed active RFID labels including transistor circuits and photovoltaics. Professor Bernard Kippelen is in charge and an organization has been set up to commercialise the products. It is called LumoFlex and it has a website www.lumoflex.com in preparation.
For more attend "Active RFID Summit" San Antonio Texas November 15-16. See www.activeRFIDsummit.com