For some reason I never tire of this. Here's a brutally factual evisceration of Ann Coulter's disgrace of a book over at TalkReason. I particularly enjoyed his obliteration of this particular Coulter Canard:

As I understand the concept behind survival of the fittest, the appendix doesn't do much for the theory of evolution either. How does a survival-of-the-fittest regime evolve an organ that kills the host organism? Why hasn't evolution evolved the appendix away? (Another sign that your scientific theory is in trouble: When your argument against an opposing theory also disproves your own.)

...where he goes on to explain that while an appendix is certainly a biological liability, the fact is that small appendices are more vulnerable to appendicitis than large ones are, and thus, natural selection acts in favor of the large ones.

It's amazing how few evolution deniers actually bother to learn a damn thing about what it is they hate so much.