PZ Myers

http://www.uncommondescent.com/cambrian-explosion/don%E2%80%99t-ask-us-how-the-most-complex-eyes-appeared-at-the-beginning-instead-we-offer-to-solve-a-tautology-for-you/

This encapsulates Darwinian unfalsifiability:

Here was PZ’s reply: “I wish I could get that one thought into these guys heads: evolutionary theory predicts differences as well as similarities.” This is rich: If PZ is right, and evolutionary biology predicts both similarities and differences between vertebrate embryos, then it would seem that evolutionary biology really predicts nothing at all about development and is unfalsifiable regarding the evidence from vertebrate development. According to PZ, evolutionary theory predicts whatever it predicts, conserves whatever it conserves, and modifies whatever it modifies. Some theory.

http://www.evolutionnews.org/2011/06/demystifying_the_debate_with_p048011.html