Hand cranked devices or solar panels for re-charging cell phone, etc... are becomming all the rage, but they are not well integrated with the ongoing pace of life. We can't be stopping to unfold panels or madly crank cranks while waiting for our mobile electronic devices to be re-charged, now can we?
remember reading something about a system that installed in a kneepad and used the flexing of that joint to generate electricity for mobile electronics. I personally like the idea; although Im sure it would become uncomfortable after wearing it for a long time.
Others here have posted ideas for mobile power generated from the users motion via the lungs and blood flow, etc... all of which require fairly invasive installation. No thanks.
The most comfortable thing I can imagine is an air pillow that fits under my arm, in a holster somewhat like those used for a concealed gun and which I can squeeze to force air out through a micro sized turbine to generate electricity.
As I chat on my cell phone or browse the web my left arm calmly rises and falls, building up my deltoid (on that side only), ensuring I never want for power, and that am left completely alone by anyone who sees me.
Given adequate practice, I bet I can play simple songs on the micro turbine by varying the pressure I put on the bag.