Ananova.com has an article about the potential for an MP3 player being built into breast implants. "One boob could hold an MP3 player and the other the person's whole music collection," so states the piece. Wireless headphones and Bluetooth would be added to the mix, according to Ian Peterson of BT Laboratories, who says such a device is feasible within 15 years--silly but plausible and certainly interesting. I guess that would mean you'd carry one fewer gadget.