Irreducible Complexity is a sad, sad argument which is tiring to all biologists who study evolution. Not a single convincing argument has ever been put forth by the people who defend it. The page Il Duce refers to uses the human eye as an example. Today, anyone who doubt such things luckily don't have to look further than good old Wikipedia to read up on how eyes have evolved, from a simple organ to one more complex.
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Evolution of the eye - Wikipedia, the free encyclopedia
Don't believe in creationist nonsense. They use every dirty trick in the book, such as deliberately misquoting Charles Darwin and other famous scientists in order to warp their original intentions/writings. Creationist writers on the internet are fanatical, manipulative wankers of the worst sort.