Onnay Okheng

Add the official Google +1 button to your WordPress blog to let visitors recommend your pages right in Google search results without having to leave the page. Place anywhere on your template.
Google +1 is the first plugin to bring total Google +1 support to your WordPress site. It features template tag (both fully customizable on top or bottom of content) allowing you to place as many Google +1 buttons on your site as you want, where ever you want. It also comes with built in support for all 46 of Google locale / country API�s.
Here is the <a href="http://www.screenr.com/0HBs" rel="nofollow ugc">demo</a>.
Contact me for say hello <a href="http://onnayokheng.com" rel="nofollow ugc">Onnay Okheng</a> or buy me a cup of chocolate 🙂

Add Google PlusOne

It features template tag (both fully customizable on top or bottom of content) allowing you to place as many Google +1 buttons on your site as you wan …

Bainternet

This Plugin lets you add the new Google +1 button to your site or blog automatically in your posts or pages.
Main features:
<ul>
<li>Automatically button to posts, pages.</li>
<li>Easy configuration screen.</li>
<li>Four display styles (standard, small, medium, tall).</li>
<li>Show \ Hide count.</li>
<li>Over 40 languages to choose from.</li>
<li>Use as shortcode.</li>
<li>Use as template tag for easy integration with your theme or plugin.</li>
<li>Use in widgets.</li>
<li>
any Feedback is Welcome.</li>
</ul>
check out my <a href="http://en.bainternet.info/category/plugins" rel="nofollow ugc">other plugins</a>

Simple Google +1 Button

This Plugin lets you add the new Google +1 button to your site or blog.

Add Google PlusOne vs Simple Google +1 Button