I think ID should be taught in science class. Along with a new theory that god evolved naturally over billions of years. Or maybe god was designed. OK, lets modify the new theory, where god is designed by aliens who evolved naturally over billions of years. Come to think of, why bother with the aliens or god? OK, lets just have humans evolving naturally, scratch the ID teaching.
Actually, I am beginning to favor teaching evolution, creationism, and ID PROPERLY in the science classroom. Teach the scientific theory of evolution presenting the voluminous amount of evidence that supports it. Teach that creationism is not science because science cannot include any supernatural, and therefore untestable, phenomenon, and then teach that ID is really just creationism in disguise to get around that pesky First Ammendment and is no more scientific than creationism. Of course, that's probably not what creationists/ID'ers have in mind when they shout "Teach both sides!"