Excuse a rather profane title of this site (I used Galactica's equivalent to moderate). I will make an exception in posting it here because of this leads to a network of little sites with some decent explanations of why should we oppose blu-ray, HD-DVD and related technologies. In short it's all about DRM, but these sites help understand the details.
Which sites? Well, in the footer of the one I'm linking to there are links to others.