From Ananova,

Computer chips that store music could soon be built into a woman’s breast implants.
One boob could hold an MP3 player and the other the person’s whole music collection.
BT futurology, who have developed the idea, say it could be available within 15 years.

That’s sooo 2003. The video iPod is here now. Where’s the in-tit rear-projection display? You could watch a movie about boobs, and navigate with the familiar iPod scroll wheel/areola.