So, what’s wrong with Expelled? Check out the Scientific American article on it. Or take a look at what the Center for Inquiry has to say. Even FOX doesn’t like it. (Thanks to CFI for these three links!). Or check out what Richard Dawkins had to say about the movie.
And in case you need convincing: Intelligent Design is not science but rather Creationism in new clothes. You can read a CFI position paper on that or watch an excellent Nova show on the Dover Trial. PBS has also created a multi-part series on evolution, which is very fascinating.