Well lets see what Google BLog says about this new feature."Have you ever wanted to mark up Google search results? Maybe you're an avid hiker and the trail map site you always go to is in the 4th or 5th position and you want to move it to the top. Or perhaps it's not there at all and you'd like to add it. Or maybe you'd like to add some notes about what you found on that site and why you thought it was useful. Starting today you can do all this and tailor Google search results to best meet your needs.
Today we're launching SearchWiki, 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. If you are wondering if you are signed in, you can always check by noting if your username appears in the upper right-hand side of the page.
The changes you make only affect your own searches. But SearchWiki also is a great way to share your insights with other searchers. You can see how the community has collectively edited the search results by clicking on the "See all notes for this SearchWiki" link.
This new feature is an example of how search is becoming increasingly dynamic, giving people tools that make search even more useful to them in their daily lives. We have been testing bits and pieces of SearchWiki for some time through live experiments, and we incorporated much of our learnings into this release. We are constantly striving to improve our users' search experience, and this is yet another step along the way.