At just 4.5mm thin, the 4GB CVSJ-1304 from Chinavision is probably the world’s thinnest portable media player. That’s what the company is claiming and I think they might be right. With a 1.8 inch touch screen that has a resolution of 160 x 128, and support for media formats such as MP4, MP3, WMA, ASF, and WAV, the player also has an FM tuner, rechargeable battery and USB connectivity. It’s not a bad looking player at that. How thin can we get and still be able to touch the device without breaking it?