Today I had a little chat with Thomas Pfeiffer, who created the Sandy 3D engine.
A while ago I came across his AS2 image-distortion class. Remembering that while implementing hardback-pageflip functionality in my Book component, I decided to port the class to AS3.
Thomas was so kind to give me permission to publish my AS3 version of his class on my blog, so here it is:
Tam Ho posted this link to a Flash CS3 example in the comments, here it is: