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.

rohanpawale

<a href="http://www.techlunatic.com" rel="nofollow ugc">Author Site</a>| 
<a href="http://techlunatic.com/2011/07/best-google-plus-one-wordpress-plugin/" rel="nofollow ugc">Plugin Home Page</a>
This plugin shows google +1 (plus one) social share button in three different position and styles.
<ul>
<li>
Automatically display Google +1 button Above the post, below the post, both above and below or floating left side of post.
</li>
<li>
Option to select the different button style (Standard, small, medium and Tall)
</li>
<li>
Javascript is by default loaded in footer (recommended).
</li>
<li>
Left side floating option can be configured. The top and left spacing can be configured according to your site layout. Also the floating position of button can be fixed or absolute. All can be easily configured.
</li>
<li>
Option to manually display the share box at any position.
</li>
</ul>

Add Google +1 (Plus one) social share Button

WordPress plugin for Google +1 (plus one) social share button. Can add the it before post contents, after and also floating on left hand side of the post.

WP PlusOne This vs Add Google +1 (Plus one) social share Button