Yup. I would highly recommend a helpful 404 page rather than "silently" redirecting the user to a different page that they didn't type. Just put a search box, a

Yup. I would highly recommend a helpful 404 page rather than "silently" redirecting the user to a different page that they didn't type. Just put a search box, a link to the homepage and "Did you mean these similar pages:" with a list of links.