cd cases are 5x5.5in and dvd cases are 7.5x5.5in. Even though data dvds are sold in cd cases they remain described as "cd cases" when sold alone and not dvd cases.

I think Blu-ray has little future at the moment. Not enough people are signed up to it, the first recorder on the market cost $1000 and had a hardware fault in the Genesis chip that reduced picture quality to around standard dvd, so huge embarrassment all round. Also Sony is launching HDTV camcorders in Japan which does not look like a great vote of confidence in their own rival, incompatible system