Today I learned about a Buddhist publication from Australia called Gentle Voice: A Newsletter of Siddhartha's Intent. The past two issues (available online) provide articles on the symbolism of the Wheel of Life. I'm reading them now. I also found a site that provides shorter descriptions of each section of the work online (Firefox users, this doesn't work in our browser... you have to use IE). If you've ever wanted to learn more about the Wheel of Life, these resources might be of help.