In essence, Behe argued that because removal of any component would render the system non-functional, such a system could not be produced by continuously improving the initial function (which continues to work by the same mechanism) by slight, successive modifications of a precursor system (p.39 of Darwin's Black Box: The Biochemical Challenge to Evolution).
Behe's books, of course, appeal to those who know very little science and who are passionately committed to belief in special creation, particularly the disguised creationism passed off as "intelligent design theory". In the July 1 New York Times, evolutionist and atheist evangelist Richard Dawkins reviews Michael Behe’s new book, The Edge of Evolution. Dawkins points out that Behe has been forced to retreat from insistence upon "irreducible complexity" to further bad science and inaccuracies. He refers to Jerry Coyne's more detailed critique of the scientific distortions that Behe has resorted to in his desperation.
Michael Behe's illogical arguments for intelligent [sick] design theory are such an embarrassment that Lehigh University has placed a disclaimer on their Department of Biological Sciences website:
"The sole dissenter from this position, Prof. Michael Behe, is a well-known proponent of "intelligent design." While we respect Prof. Behe's right to express his views, they are his alone and are in no way endorsed by the department. It is our collective position that intelligent design has no basis in science, has not been tested experimentally, and should not be regarded as scientific."
One can only imagine that if Behe had not already had tenure when he began publishing religious pseudoscience, then the university would have sent him packing to knock on the doors of that infamous junk tank, the misnamed Discovery Institute.
In The New Republic, Professor Jerry Coyne has published a good critique of Behe's retreat from disproven "irreducible complexity" into attributing mutations to God's intervention. The Edge of Evolution: The Search for the Limits of Darwinism is Behe's feeble attempt to conjure up creationist pseudoscience for credulous dummies.
Sites Elsewhere : Panda's Thumb An Open Letter to Dr. Michael Behe, An Open Letter to Dr. Michael Behe (Part 2) ERV Michael Behe, please allow me to introduce myself..., Hello again, Michael Behe! Science After Sunclipse Chu-Carroll on Behe’s The Edge of Evolution