Just read on Kurzweil's site that scientist from Berkeley Lab have developed a way to generate electric power using harmless viruses. They have essentially created a generator which uses these viruses to convert mechanical energy into electricity.
You can see a demonstration in the video below where a researcher taps a virus coated electrode which powers a small liquid-crystal display. Go to 0:47 to see it in action.
With this technology, coupled with the ever improving ability to capture and store electricity, I envision us all one day wearing virus embedded shoes which will be used to power our iPhones, Google Glasses etc.