Well, as far as HD DVD vs. Blu-ray goes, it looks like we've pretty much passed the point of no return now; with each passing day it seems less and less likely that a compromise will be reached on a next-gen format. The ongoing peace talks between the two camps, which have been on-gain, off-gain for months now, seem to have finally dissolved. It's disappointing, but however you feel about the fact that the HD DVD and Blu-ray factions squandered countless chances to make it right and come together, it looks like in just a few short months they're going to be duking it out mano a mano right in our livingrooms. There may not be a lot we can do to fight back - apart from refusing to adopt either format out of sheer spite of their pigheadedness - but no matter what we might as well at least arm ourselves with the knowledge necessary to understand the nature of the situation at hand.
HD-DVD is now officially discontinued. However, information on HD-DVD, and its comparison to Blu-ray, is still contained in this article for historical purposes, as well as the fact that there are still many HD-DVD player owners, and HD-DVD players and discs will continue to be sold and traded on the secondary market for some time. In fact the difference between blu-ray and hd dvd is apparent.
The Current State Of DVD DVD is very successful, and will definitely be around for some time. However as it is implemented, DVD is not a high-definition format. DVD players typically output video in either standard NTSC 480i (720x480 pixels in an interlaced scan format), with progressive scan DVD players capable of outputting DVD video in 480p (720x480 pixels displayed in a progressively scanned format). Although DVD has superior resolution and image quality, when compared to VHS and standard cable television, it is still only half the resolution of HDTV.
Blu-ray and HD-DVD Format Information However, there is a catch with regards to high definition DVD recording and playback; up until 2008, there has been two competing formats that were incompatible with each other.
Blu-ray Format Support Blu-ray is supported on the hardware side by Apple, Denon, Hitachi, LG, Matsushita (Panasonic), Pioneer, Philips, Samsung (also supports HD-DVD), Sharp, Sony, and Thomson (Note: Thomson also supported HD-DVD).
On the software side, Blu-ray is supported by Lions Gate, MGM, Miramax, Twentieth Century Fox, Walt Disney Studios, New Line, and Warner. However, as the result of the discontinuation of HD-DVD, Universal, Paramount, and Dreamworks are now on board with Blu-ray.
HD-DVD Format Support HD-DVD has been supported on the hardware side by NEC, Onkyo, Samsung (also supports Blu-ray) Sanyo, Thomson (Note: Thomson also supported Blu-ray), and Toshiba.
On the software side, HD-DVD has been supported by BCI, Dreamworks, Paramount Pictures, Studio Canal, and Universal Pictures, and Warner (only until May 2008 - at which time it will be Blu-ray exclusive). Microsoft had also lent its support to HD-DVD, but no longer, as Toshiba has ended HD-DVD support.
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Author's Bio: 

The authour is the Lead Audio and Video Analyst for PC Magazine.She spends most of his time in the labs testing ipod and media extenders.Now she is focusing on how to convert blu ray to dvd with a blu ray ripper tool.