Google may be "just" a search engine for most folks, but it can also be a very serious hacking tool. This PDF from Johnny Long is on his I Hack Stuff site. If you want to learn more about what Google is telling other people about your site(s), read on! And if you want to get a tool to do it, take a look at SiteDigger from Foundstone. If you publish on or to the Internet, this is something you probably want to take a closer look at!