Hope this is not a repost. There's a device from Olympia which allows any flat surfaces to be turned into a speaker.
Full article: http://news.zdnet.co.uk/story/0,,t269-s2106596,00.html
Wonder how good the sound quality is
The Soundbug was developed in partnership with Newlands Scientific, a commercial research company that was spun off from Hull University.
The Soundbug transmits the sound to the flat surface by way of a small piece of Terfenol, which is a mixture of rare earth metals and iron. This substance is placed within an aluminium case, around which is wrapped a coil.
Passing electricity through the coil causes the piece of Terfonal to slightly expand, resulting in a force of 400 pounds, explained Newlands Scientific managing director Brian Smith. Once attached to a flat surface, Soundbug will transmit electronic signals into mechanical energy -- causing the flat surface to vibrate and broadcast the sound.
Full article: http://news.zdnet.co.uk/story/0,,t269-s2106596,00.html
Wonder how good the sound quality is