Pirates of the Caribbean: behind the ILM digital effects

BB pal Bonnie of Lucasfilm says,

The work of several Star Wars veterans (including VFX supervisor John Knoll) is being showcased in a special website just launched to explore the mind-blowing visual effects of this past summer's "Pirates of the Caribbean: Dead Man's Chest." Interactive clips at this new site allow you to peel back layers of animation to see what ILM had to start with before transforming actors wearing tracking markers into astonishingly real characters.

Link. Image: screengrab detail from the very cool "Real or ILM?" section of the site.