SearchWiki is a way for you to customize search by re-ranking, deleting, adding, and commenting on search results. With just a single click you can move the results you like to the top or add a new site. You can also write notes attached to a particular site and remove results that you don't feel belong. These modifications will be shown to you every time you do the same search in the future. SearchWiki is available to signed-in Google users. We store your changes in your Google Account.Many of you like me would have wondered - does this allow googlers the power to move the search results!?! The answer is NO. As stated in their blog post, the changes you make only affect your own searches.
To enable this new feature, just make sure you are logged into your Google Account and end your search query with a * (See in the screenshot above). You can then see the new icons beside your search results.