Flexible smart sensing tags that combine sensing elements, electronic control circuits and usually silicon ICs in a flexible hybrid device are an important area of organic electronics research and development. Printing technology is a good fit for the fabrication of these devices because the device density and circuit speed are low, the materials are flexible and the need for several different materials favors additive manufacture. Organic TFTs provide the control logic and have been widely studied for many years. Complementary TFT circuits are preferred for most circuits and while OTFTs have improved greatly there is still a challenge to make printed complementary devices with the same structure and matched characteristics. Circuit design that mitigates device variability is needed. Organic electronic materials also provide many of the sensors, memory and actuator devices that provide functionality to a smart sensor tag. Organic electro-chemical TFTs (OECT) are important devices for high current circuits and as chemical and physiological sensors, and they provide novel electronic attributes that give dynamic circuit elements. Humidity sensors use the property that organic materials are permeable to moisture and hence change the device capacitance. The piezo- and ferro-electric polymer PVDF is used for memory devices and actuators. Examples will be given for each of these organic electronic technologies and their integration in prototype smart tags.