Brian Kotek has written an article on CFC polymorphism for Builder.com (see http://builder.com.com/5100-6386_14-5144505.html). While the explanations feel a little skimpy at times, this is still worth the read.
Thanks for the interest, Ben. One thing I should point out is that Builder only gives me about 1000 words for my articles, so I have to do a lot of cramming, and even then they sometimes edit them down further. I try to do the best I can in the space they give me.