The Yamaha BODiBEAT MP3 player uses an accelerometer and a heart rate monitor to determine your workout speed and accordingly matches songs to your pace. For example, when you run faster, the music gets faster. I'll hold judgment on this one until I can actually try it. It may be interesting.

FYI, BODiBEAT is going to launch August 1st, 2008 - www.bodibeat.com.
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