It looks like HD-DVD hasn’t taken its final gasp of air just yet. The HD-DVD add-on drive for Xbox 360 is selling like crazy, having pushed over 155,000 units since its introduction a few short months ago. The real insane part here is that’s over 150% of existing stand-alone HD-DVD player sales. Seems like Xbox owners are a value conscious bunch. Contrary to popular opinion, this puts American HD-DVD and Blu-ray player sales at a dead heat, with both formats moving roughly 255,000 units. Blockbuster’s recent announcement will certainly have a negative impact on HD-DVD media and player sales, but the war isn’t over just yet.