<A target="_blank" href="http://wildunknown2.blogspot.com/2011/03/admin-notes-setting-up-robotstxt-on.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+wildunknowncom+%28Wildunknown%29">John James explains how to use a robots.txt file to keep Google's search engine</A> from indexing files on your servers. He's provided some links to help you build and validate your file.