iPod as application platform

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It makes a lot of sense that Apple and Nike would team up to create an iPod based running app. With a pedometer in your shoes connected to your iPod you can get distance, pace, etc. (A "cyclocomputer" in my world, not sure what runners call it.) This is the first endorsed app running on an iPod isnt it? If so that makes it pretty significant. (It is cool either way, but it is also a milestone if the iPod moves into mobile device app running territory, versus just your images, movies and songs [heh, "just" ;)].)