How do you cut/process a whole pineapple?
First, you have to peel the pineapple. 


Cut off the top and bottom of the pineapple and set it upright on your cutting board
Using a sharp knife shave the skin off from top to bottom, following the contour of the fruit


You then have two ways to cut it into either rings or chunks:

Pineapple Rings

Next, you lay it sideways and cut it into slices as thick as you wish.

You then use a paring knife to cut out the corky centers of each slice. You now have a pineapple ring.

Pineapple Chunks

Next, cut it lengthwise down the center. Cut out the exposed corky center. This can be done with a V-shaped cut. You can then break down the fruit into chunks as desired.

Here is a step-by-step guide with photos: http://howtocutapineapple.com/

Here is a step-by-step guide on video: http://www.youtube.com/watch?v=AJJ-iQkbRNE