Search Wiki is the newest feature to Google, allowing users to customize search results, and is available only to users with Google accounts.

The feature will allow users to rearrange search results, tailored to what they frequently use, according to Brand Republic.  

Users will also be able to add and remove URLs relevant to their own searches.  They can make notes on sites that will be "available for future searches."

Search Wiki allows users to "share insights with other searchers," said an engineer behind the project.

Source:  Brand Republic