Google have made ​​+1 button for websites. You can get it here: http://www.google.com/webmasters/+1/button/index.html Fill in a short form and get the button to your site. Pay attention to theAdvanced settings - there you can explicitly specify the URL of the page. Why is it very important - read here.
I have put this button on a few blogs, if there are results I will inform about it.