I sit 8' from a 58" screen and the difference is astounding. Even my wife noticed the bugs buzzing around kong that she had never seen before. You start to notice little things, like smoke rising from the distant building when kong is on the skycraper, or that you can read the small print on the chloroform bottle when it rolls across the floor, but what really affects the presentation is how colorful everything is. At certain points, I really got the 3-d effect, it was downright scary when one of those huge worm bugs in kong darted out of the screen at me and I've seen the movie at least 3 times before. Everything is more colorful with more detail, and even when you aren't focusing on the details in the films, you find yourself being sucked into the movie more. Scary parts are scarier, drama is more dramatic, action scenes are more suspenseful. Films are entirely more engaging. It all makes sense too, because the more accurately you can depict the images, the more lifelike they appear, and thus the more engaging the film is. I'm watching all of this on a 720P screen, I doubt I'd see much of a difference between 720P and 1080P at my screen size and viewing distance and I simply can't afford a 1080P screen. But between regular dvd and Hd-DVD, the difference is huge.