"The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people."
This amendment says that just because certain rights are not specifically mentioned, individuals cannot be denied those rights.
This news footage is one example of how amendment nine applies. The health care reform the citizens are protesting does not have a specific law against it; however, that does not deny them the right to surpass the law. Under the ninth amendment, the people are able to fight for the rights they want.
A Brief Review of the 9th Amendment
This link provides an interesting analysis of the ninth amendment, asserting that the rights are determined by the people rather than the legislators. The first nine amendments are dedicated to the people and this site reminds us of that.