This title is sure to go undisputed for a long time. But while it may win on the terms of size, one may ask what about with regards to quality. The product is just full of air (no really) but has iPod (or any MP3 player) connectivity in addition to stereo speakers. This allows it to claim itself as an iPod dock since the basic criteria are fulfilled.
The controls are on the fabric (or rather embedded in) and the dock or pillow retails for USD $60. Just make sure to get a pedal pump or something to blow it up at the same time. There are no details about size, but noe can take the photographic scale to be an indication of just how big the inflated product would be.