DZVO

This plugin allows you to display a buttons which shows the voting for a social news message (digg,sphinn …) on your blog post. 
You will find a collection of voting buttons for different social-news-services <a href="http://www.zauberpage.de/vote-it-liste.html" rel="nofollow ugc">here</a>.

Vote It!

Vote It! Buttons for Blogpostings. Set very simple a digg, sphinn or another social-news-button in your blogpost.

Phoenixheart

“Digg This O’ Mine” is a plugin that allows you to place the famous <a href="http://digg.com/tools/integrate" rel="nofollow ugc">“Digg This” button</a> at the end of your posts, pages, or anywhere at your choice. While it will run out of the box, it has several options that can be used to custom the button to fit your needs:
<ul>
<li>Automatically add “Digg This” button to your posts (yes/no). Default is set to Yes.</li>
<li>Automatically add “Digg This” button to your pages (yes/no). Default is set to Yes.</li>
<li>Background color around the button. The option is provided with a handy color picker. Default is “#ffffff” (white)</li>
<li>Skin of the button. Digg offers 2 skins: Default and Compact. Default is set to “Default” 😉</li>
<li>Open the Digg link in a new window (yes/no). Default is set to No.</li>
</ul>

Digg This O' Mine

Place a "Digg This" button at the end of your posts, pages, or anywhere at your choice.

Vote It! vs Digg This O' Mine