A guy known only as ChaN has got some serious engineering skills. His talents include hardware, software, firmware, DSP, etc, but the thing that always strikes me is his protoyping abilities. He hardly ever makes real PCBs, instead he prefers to use tiny enamel coated wire to make connections between itty-bitty surface mount parts. His latest project is no exception. I think the concept of moving the actual device around to control it is kind of goofy (it’s an MP3 player, not a Wii controller), but the implementation is something to behold. Check out the rest of his site, he’s done tons of cool stuff.