I have just created a free basic subscription at Vimeo. Running the HD video there through my HDTV is stunningly spectacular. Even it you never upload a video there, it is worth creating an account just to be able to save your favorites from this fount of creativity and beautiful imagery. Here’s one example.
I recommend that you click on the button at the bottom right of the video (with the arrows pointing to the four corners of your screen) to cause it to display in full screen mode. It warrants every pixel you are willing to devote to it.
This video is one of many HD videos available at Vimeo.