Put lots of pop-ups and try to trap all your surfers. Also try out doing auto installs and changing their home page and add lots of bookmarks.
This should go over especially well with reviewers who get your 404 page by mistake.
OR
Just make up a nice page with no pop-ups or anything with links that you think you might make a sale off of.
This will probably make you much more popular with your surfers and webmasters reviewing your stuff.
