Mike Gene at Telic Thoughts has a fascinating post that traces the early development of the modern Intelligent Design movement. He shows quite convincingly that its connections to Creationism were tenuous at best and that attempts to conflate ID and creationism are inapt.
You've no doubt heard the argument which claims that ID grew out of Creationism and that therefore ID is just creationism "in a cheap tuxedo." Even if it were true that ID descended from Creationism, which Gene's argument rebuts, nothing much about the nature of ID follows from that. It could be noted, for example, that the anti-IDer believes that mankind has descended from ancient microbes, but he would never think to say that mankind is just a microbe in a cheap tuxedo. It is just silly to argue that because two conceptual paradigms share a common lineage that therefore they are identical, or nearly so. If that argument were valid then chemistry would be very nearly the same as alchemy, and Darwinism would just be Lamarkism with make-up on.
And to think that this is the argument that convinced Judge Jones in Kitzmiller v. Dover that ID is just Creationism and therefore not real science. It sure doesn't take much to convince someone who's eager to be convinced anyway.