Here is the texture pack page I'm talking about
Hi there, this is Benny Hill. I wanted to clarify the difference between the high def pack and the low def pack. So I made these pictures and videos. The difference is quite striking when you're in game, but the examples given on the main page were not very clear.
Here is a zip file with the raw TGAs for closer inspection
The images are standard textures by default. Mouse over the images to see their high definition counterpart.