As I wandered by Apple's website today (as I do most days), I saw a new banner along the bottom proclaiming some involvement between Nike and Apple. I clicked, and I like what I've seen.

Nike will soon be releasing a new line of shoes, called Nike+.  Beyond whatever latest and greatest shoe technology they posses, there's a small pocket beneath the sole.  What goes in the pocket, is available for $29 as the Nike+ iPod Sport Pack.  The Sport Pack gets you a small sensor that fits in the shoe's sole-pocket, and a wireless receiver that plugs into your iPod Nano.  (I'll assume a regular iPod will work too, but is just considered too heavy/bulky.)

So while you run, the sensor relays data to the iPod, which then notifies you of average pace, distances, time, etc via voice over top of your music.  You can set exercise-length playlists, have 'boost' songs for those tough uphill segments of your run, and then download your exercise results to your computer when you're through.  Your results can be tracked over time, and Nike even has a great website setup for comparing results, finding music, and tracking your own progress.