SISCOM WEB DESIGN

This is a simple plugin without any hassles, it automatically adds the Google Plus One Button to your WordPress posts and pages. 
There is no admin for this plugin since everything is done automatically, just upload the plugin , activate it and it will add the necessary code for the Google +1 Button to appear on every post and page. 
The Button will be located at the Top-Right Corner Inline with your posts.
Features:
<ul>
<li>Automatically included on Posts</li>
<li>Automatically included on Pages</li>
<li>Button location is at the Top-Right Corner Inline With the Text</li>
<li>Simple enough, Does not slow down your site, Does not mess up other plugins</li>
</ul>

WP PlusOne This

The WP PlusOne This plugin, automatically adds the Google Plus One ( +1 ) Button to your WordPress posts and pages.

webgig

<a href="http://www.thewebgig.com" rel="nofollow ugc">Author Site</a>| 
<a href="http://www.thewebgig.com/google-plusone-button-wordpress-plugin/" rel="nofollow ugc">Plugin Home Page</a>
This plugin displays the google +1 button in different styles.
<ul>
<li>
Display Google +1 button in the posts, pages, single posts or everywhere.
</li>
<li>
Display Google +1 button above the post [‘Top’], below the post [‘Buttom’], both above and below [‘Both’], or floating left side of post [‘Left’].
</li>
<li>
Display Google +1 button in four different sizes (Standard, small, medium and Tall)
</li>
<li>
Display Google +1 button using Template Tag <?php if(function_exists(‘twg_gpo_button’)) twg_gpo_button();?> or Shortcode [twg_gpo_button] at any desired position.
</li>
<li>
Nice Preview in the settings page with a dummy post.
</li>
</ul>

WP PlusOne This vs Google Plusone(+1) Button