I found this article while doing some research on the web, and i thought you'd might like this little excerpt:

-Ambiguous or incorrect explanations of scientific phenomena may help explain why one new study, which has been submitted to the journal Science Education, found that students who had taken high school physics classes that used textbooks did substantially worse in college physics than those whose high school classes used no textbooks at all.

An earlier study by the same researcher, Philip Sadler of the Harvard Graduate School of Education and the Harvard-Smithsonian Center for Astrophysics, found that in some high-school science classes, students at the end of the year scored worse on their understanding of basic science concepts than they had before the class began. In typical high school classes, he said, ''The learning is minimal, and in some cases negative. Some kids have more misconceptions at the end of a course than at the beginning. ''

Here's the link to the website address: Textbooks flunk out