This is one of the few instances where I'm behind the ACLU. They are trying to preserve the remnants of science education in high school. This ID nonsense is polluting the science classes and requires more 'dumbing down' of other science classes to make the statement fit. Inserting ID into school by rule of School Board is intellectual affermative action.
Whether or not you believe ID should be taught, do you actually believe the ACLU is right in saying that this is UNCONSTITUTIONAL? You can fight ID on other grounds, but a teacher telling students about a book on ID they can read on their own time does not violate the first amendment.