Google announced the debut of a site-blocking search tool via its on Thursday. The tool is simple to use: When you click on a site in a Google search and then go back to Google -- presumably because you weren't satisfied with what you found -- you'll see a new option on the results page to block the site from future searches. All you have to do is click it, and the site will never show up for you again.

Your search site-blocking preferences are saved in your Google account, so you'll have to be logged in for the feature to work.

And don't worry: Your search-blocking changes aren't set in stone. Anytime a site is omitted from a search because of your blocking, Google will display a small message letting you know something's been removed. You'll have an option to unmask the hidden results, if you're so inclined. You can also manage your virtual blacklist via your Google search settings.

The Google search-blocking feature will become available to everyone over the next few days. As of now, it'll function only in English and only for users on Chrome 9 or higher, Internet Explorer 8 or higher, and Firefox 3.5 or higher.