I will simply dissect greendawns post and use it as an outline demonstrating the factual proof of evolution and intrinsic absurdity in creationist arguments:
"Evolution is too good to be true, common sense dictates that the extreme complexity of living systems (much more so than a snow flake) had to be directed by an intelligent agent that produced everything for the glory and good pleasure of man."
1) "Evolution is too good to be true" > Nonsensical remark. Evolution is a body of factual evidence rigorously obtained in the fields of molecular biology, molecular genetics, anthropology and evolutionary anatomy. It is not intended to be "good", it is a collection of scientific facts that stand independently of emotional evaluations. Indeed, this very remark demonstrates that typical creationists try to make "emotional" arguments against cold hard objective evidence.
2) "Common sense dictates that the extreme complexity of living systems": Again, a fallacy based on ignorance and lack of understanding of how biological systems evolve and operate. Evolution takes place by gradual selection of simple, elegant biological interactions. Life began with the simplest biochemical interactions (which can be duplicated in a petri dish by a high school student) and only then proceeds to add additional simple mechanisms and structures. Single celled organisms become multicellular, multicellular organisms develop a rudimentary nervous system and sensory organs, slowly more and more systems are added through environmental pressures interacting with random genetic selection until a new species appears.
3) "had to be directed by an intelligent agent" : Again, yet another logical fallacy partly related to the points raised in comment 2. Moreover, the simple and obvious fact is that living organisms are extremely POORLY "designed", if one were to use that argument. Would a supremely intelligent being create a biological organism susceptible to cancer, diabetes, asthma, multiple sclerosis, Parkinsons, Huntingtons, Alzheimers, CJD, Kidney disease, Arthritis, Schizophrenia, etc etc? What is the answer to this question? Ah of course. Original sin! But here is the rub, the only way creationists can account for the GLARING "design flaws" in the natural world is to resort to Judeo-Christian myths created to explain away the "imperfections" of the physical world. Look at the world around you. Look at the overwhelming flaws in human anatomy, the weakness of the human mind, the fallibility of human memory, the horror of birth defects. If this was "created" by a "designer", such a being would have to be either 1) outrageously cruel to willingly be the Maestro to symphony of horrors, or 2) a complete moron.
4) "that produced everything for the glory and good pleasure of man".> Wow. Speechless. Dont even know where to begin with this one! Tell me, on what logical ground does this argument stand? First, if said deity was responsible for the universe and all that is in it, by obvious implication it is responsible for all the pain, horror and misery that exists in even greater measure. Second, comments such as this betray the fundamental ARROGANCE of the creationist position: Somehow, "human beings" represent the pinnacle of perfection, the glory of the universe, as we continue to murder each other, destroy the planet, exercise perpetual stupidity with pointless wars and religious crusades, etc etc. Newsflash: WE ARE ANIMALS. We breath the same oxygen, have sex, procreate, eat, defecate, fart, build "nests" called "houses" and live in "colonies" in pretty much the same manner as 90% of the OTHER biological organisms on this planet. We have evolved "sentience" and "awareness" of our own mortality. Yes that sets us apart within the animal kingdom. Does it make us superior? Does it suggest that in our infinite wisdom, we simply MUST have been "designed" by some sky-god sitting on a throne in the Pleiades? I think not.
Finally, GDs comments aside. The evidence for human evolution is now OVERWHELMING. Transitional forms of early hominids ranging from Australopithecines, to H. Habilis, to H. Erectus, to Cro Magnon, to corollary species such as the Neanderthals, clearly and convincingly demonstrate the gradual ANATOMICAL evolution of the entire human form over millions of years. Is it a coincidence that we share over 95% of our genetic makeup with our closest primate relatives? Is it a coincidence that these same primate relatives demonstrate remarkalbe "proto-human" behavioural patterns and cognitive abilities? Other posters have listed other pieces of factual information demonstrating the obviousness of biological evolution. It is really the choice of the individual to carefully study this information (and any first year university level biology textbook will provide all essential background info) or to continue to wear the blinders of ancient, primordial superstition.
It is FEAR that prevents creationists from accepting the facts of biological evolution. Fear of being alone in the universe, fear of the reality that this human life is ephemeral and dependent solely on our biology and nervous system. Fear of accepting a more humble position for humanity within the vastness of the universe.