Just added Google +1 to my blog.
The +1 is the Google "like" button. It should help Google to find what kind of pages people are interested in and improve the search experience.
In order the add the +1 button go to the documentation add to your page:
<!-- Place this tag in your head or just before your close body tag -->
<script type="text/javascript" src="http://apis.google.com/js/plusone.js" ></script>
<!-- Place this tag where you want the +1 button to render -->
<g:plusone></g:plusone>
In some pages (this blog platform for example) you can’t add this code so you must use HTML5 style (I think it is better)
<div class="g-plusone" data-size="standard" data-count="true"></div>
Read more: .Net && Beyond