An idea concerning the earth's origins that states that the known universe is too complex to have evolved randomly, which is what the theory of evolution teaches. Its' critics (95% of whom call themselves atheists) slam it as being "Not science" or "A loony back door way for the Christians to try and ram religion down kids' throats". The irony is that these same people, when arguing for their belief, will mostly defend it with the theory of evolution.
I.D critics think that everyone who follows intelligent design is a Christian moron with no grasp on the real world, yet there are numerous scientists with no particular religious belief who see value in I.D. If its' such a load of crap I don't know why the atheist brigade are getting so paranoid about it? They should be encouraging schools to teach it along with evolution, kids are smart these days. Then at least when they're adults and they want to rubbish I.D they'll actually have some knowledge of it, instead of being like all the narrow-minded people don't want to see it explored as a theory at all because it challenges their faith that everything in this world is a random occurence.