Yamaha (well, unless you count scooters), but the company's new BODiBEAT looks like it could be a big hit with runners. The arm-mounted DAP contains an accelerometer that links to the earphone-mounted pulse monitor, enabling the BODiBEAT to play tracks that match your running rhythm, switching songs as you speed up and slow down. It doesn't look the like unit actually changes the speed of your music, so Yamaha has thoughtfully included a range of preloaded beat loops that remix themselves at every tempo to cover any gaps. Good thing, too, since the puny 512MB of memory means you'll be out of music by the end of the block. Expect to see the BODiBEAT popping up at the gym later this summer for an astronomical $299.