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Check out the concept shoe as shown above. It features an integrated CD-ROM, some speakers, tweeters, and a volume control knob to boot (no pun intended). Of course, it might be a little behind the times as most portable MP3 players these days use either a hard drive or flash memory and not CD-ROMs. It would be interesting to see how such a concept can take off in the near future, although I am placing my money on at least three more iPod generations before such footwear becomes possible. Itd be great if there was Bluetooth functionality thrown in for a truly wireless on-the-go audio entertainment solution.