The fact that CDs and DVDs are the same shape and size comes in handy for a lot of reasons, but isn't quite so helpful if you are visually impaired. Mitsubishi Japan has released a line of recordable CDs and DVDs with braille labeling. Good idea and a great reminder to all designers about the importance of physical differentiators. I'm not visually impaired, but I'd love to be able to tell the difference between a CD and DVD without reading the fine print. (Found through Cool Hunting).