Pervasive computing and wireless sensing continues to expand into new application areas. This has re-energized the need for ultra-low power (ULP) radios, as well as the discussion around using wakeup radios to improve the networking of these devices. New low-rate, long-range wireless standards are emerging that cover entire metropolitan areas. At the same time, existing standards such as Bluetooth and WiFi are evolving to accommodate ULP devices. This talk will cover recent trends in ULP radio design. We will begin with a survey of recently reported ULP radios, and a discussion of the trends and boundaries observed. We will then discuss recent efforts of merging industry wireless standards with ULP radios, which historically have not been compatible. Finally, we will discuss recent ULP radio implementations and observe some recent design trends.