Do you honestly believe that it's not possible to waterproof/heatproof an iPod?  The technology exists to do that, but it's not commercially practical, because no-one buys an iPod for every shirt they own.<p>I bet if I really wanted to, I could pull a shuffle out of it's case, use more expensive and denser flash memory, and shove all this in a tiny waterproof/heatproof baggie or small and thin container, swap the USB connector for mini-USB, insulate the wires, build caps for the external wiring ends, and sew the whole thing to the inside of my shirt behind my shoulderblade.  It'd have exposed ports to connect mini-USB to my computer and earbuds to my ears, and if I wanted to wash it, I'd stick the port-caps in and seal it somehow.  It'd take a fair few prototypes, but it could be done with today's tech.<p>Edit:  I don't think this is commercial viable, but if one of you guys builds it and gets rich, I expect royalties :-)