Power from heat? No moving parts?
Been around for ages, it's known as a
thermopile. I figure they're perfect for powering personal electronics. Here's my free idea - in my benevolence I shall share my genius with you all, as there is no way I could ever complete every brilliant idea I have: An ear bud mp3 player, powered by body heat, all parts within the ear buds - headphones, player and power all in one unit. (edit: call it the "eBod")
I'll admit I did not RTFA, as it has been soiled with punisher's eyes.