Easter egg: On disc 2 of the 2-disc special edition, enter Mastering The Blade. Highlight Return To Bonus. Press left and down. This should highlight the keyhole. Press OK to see a short clip of the dog and its trainer.
Easter egg: On Disc 2, highlight "Jerry Bruckheimer - A producer's photo diary", press Left three times. This should highlight some of the grass. Press OK to watch a clip of the Coconut Man.
Easter egg: On Disc 2, highlight "Creating the Kraken", press Left and Up twice. This should highlight a piece of the grass. Press OK to see how they animated the Twin Pirates.
Easter egg: On Disc 2, highlight "Fly on the set - The Bone Cage", press Left, Down and Left. This should highlight a leaf. Press OK to watch a clip with the stand-by painter.
Easter egg: On Disc 2, highlight "According to plan", press Left twice. This should highlight a leaf. Press OK to watch how the food was made for the entire film crew.
Answer: Tia Dalma is a voodoo priestess who has a history with Jack. She provided him with his magical compass and is probably responsible for the rebirth of Barbossa. Any further revelations about her will have to wait until the third film, where her character will apparently take on greater prominence.
Tailkinker ★