PBteen (a.k.a.Barn for Teens) has a line of furniture with embedded speakers in it. You can plug your iPod or whatever you want into them and voila, instant music.
One example of this line of furniture is this Flip Floor Lounger. Clearly geared at teens as I don't know too many adults who enjoy getting up off the floor.
Personally, I think the speakers look horrible. They could do a better job "masking" the speakers, or at least not make them stick out like a sore thumb.