Google has recently started testing a way for their users to vote for search results they like, either from the search results page or from the page itself.
They call it the "+1" -- see www.google.com/+1 for more information from Google.
When someone with a Google account is logged in (and most people with such accounts just stay logged in all the time), they will see a faint icon next to some* of the results, and a slightly more obvious icon when they hover over the result with their mouse.
If the Google user clicks on the icon, they will be endorsing that web page.
* - Why only some of the results? Owners of websites who want to participate will have to add a snippet of code to their websites. They also have the option to add the clickable icon to their website.
Want this for your website? Google tells you what needs to be done -- see the short version or the detailed description. If you are comfortable editing the HTML of your website, you can do it yourself. (If you are one of our Online Business Partner users, just go to the "tracking code" content holder, click "HTML", and add the snippet before or after anything that is already there.) Otherwise, check with your webmaster.