Actually, the porn industry backed HD-DVD at the beginning because it was cheaper and easier for them to produce. In the beginning they weren't able to get any Blu-Ray production lines to press their movies to disc (they were all too busy with mainstream movies). Since HD-DVD used much of the same production equipment as DVD to press their discs the porn industry had more access to gettting movies pressed to disc on it. Like Fleckrj siad the big thing in the HD-DVD/Blu ray war was the division on manufacturers and movie studios. HD-DVD was pretty much just Toshiba (and RCA a bit) and Microsoft, and only had Universal I believe as a exclusive studio. Sony, Fox, MGM, and Disney studios were behind Blu-Ray as well as the manufacutrers fleckrj mentioned. WB and Paramount supported both (until Paramount made the really strange decision of going HD-DVD exclusive like 2 months before HD-DVD gave up). The PS3 was also a huge factor like he mentioned. At first pricing really helped drive HD-DVD adoption since the players were $500 or less, and most Blu-Ray players were $1000 or more. But then the PS3 came out at $500-600 and was able to play blu-rays so it really got rid of the price differential. I personally returned my $1000 Samsung Blu-Ray player and bought a PS3 instead, and still use it as my main player in my theater room just because it works, and I haven't bothered to replace it. I'm moving my theater room this weekend though, so it will most likely finally be replaced by a dedicate player. This is all from memory though, so some of it might not be 100% accurate. I supported both formats and still have players and movies for both.