There have been two different formats for the high capacity DVD: HD DVD and Blu-Ray. The problem for most home users is that no one wants to invest money in a technology that disappears.
Apple has already decided to exclusively support Blu-Ray, and Warner (one of the big movie studios), has decided to no longer support HD DVD, throwing their support behind Blu-Ray for new releases starting later this year. A lot of analysts feel this is the death of HD-DVD, but Toshiba (the company behind HD DVD format), of course, feels that this is not a problem.
Is HD DVD dead?
Either way, this is good news for consumers, because no one wants to buy a technology that's going to become obsolete quickly.