I'm going to cheat in my own thread and highlight two things about Blu-ray that impress me the most. Oh, the colors are great to be sure, and the clarity of details is a winner, but I find that I'm absolutely mesmerized by the quality (surely a by-product of the increased clarity and detail) of three-dimensionality offered in most Blu-ray transfers. Not just the sharpness of details, mind you, but that there seems to be actual depth in the imagery (an interesting and perplexing illusion, since standard film is a 2D medium). I've never encountered this effect in even the best mastered SD DVDs; I'm not even sure I'm really conscious of it in theaters (does the relatively smaller home video screen allow this quality to be accentuated?). Even watching KING KONG on the TNT HD channel, this quality can be noted throughout, and surely it doesn't look as good as the future relase on Blu-ray will (I can't speak to the current HD-DVD, as I was never a supporter of that format). Secondly, and this may seem so minor, but I'm just continually delighted by the sharp definition of the text used in opening and end credits. There is not a trace of mosquito noise or edge-enhancement ghosting, which is ever-present, even with S-video or component cables, on virtually every SD DVD I've come across. When credits appear on Blu-ray, they are rock solid and rock steady. It's a simple thing, but it never fails to bring a smile to my face. So what one (or two; it's only fair) aspect to Blu-ray (or HD playback in general) just "seals the deal" for you?