I was positively surprised to see today next to my searches in Google some new icons.  It looked like this:

[caption id="attachment_140" align="alignleft" width="240" caption="New Google Search Engine SearchWiki Demonstration"][/caption]

First of all i thought it was a new feature of any of my plugins installed in FireFox, but after scrolling to the bottom of the result page i noticed it was a new feature from Google called SearchWiki.
SearchWiki is an enhancement to your searches with Google, which lets you select your favorite results and rank them higher; or hide those results that you do not like. Also you can make comments on each result and also see others opinion on the same result.
To be noticed that this feature will apply only to your account. It means if you chose to rank a result higher in the SERP, that will be available only to your account and it will not affect in any way how this result will be shown for the others. So don't try to move all your pages to higher positions, because that will not help you promote your web pages. However i am suspicious a lil' bit about how Google handles the info. I think Google analyzes anyway how many people rated a same page and maybe it will add some reputation to it in the SERP. But that should not be considered as true, unless Google told that officially.

Most of all i like the comment system, because with it you are able to find out other people's opinions on specific pages and that could help you improve your website.