ruudkok

With this plugin you can add the new Tweet button from Twitter to every post, and every page. The plugin is fully customizable:
<ul>
<li>Choose where to display the button (top,bottom,left,right), up to 2 times each post/page</li>
<li>Choose when to display the button (posts, pages, both or everywhere)</li>
<li>Select the type of button you like (horizontal count, vertical count, or no count)</li>
<li>Set the margins between the Twitter Button and surrounding content</li>
<li>Select a twitter account (if any) which you want to be mentioned in each tweet (e.g. via @ruudkok)</li>
</ul>

WP Twitter Button

This plugin allows you to add the new Twitter button(s) to your blog. You can choose the type of button and set where to display the buttons.

svil4ok

Twitter Button is a WordPress plugin that allows you to easily integrate <a href="http://twitter.com/goodies/tweetbutton" rel="nofollow ugc">Tweet Button</a> in your blog.
Features
<ul>
<li>Easy customization.</li>
<li>Three methods to include Twitter Button in your blog – automatic, manual or by shortcode.</li>
<li>Exclude Twitter Button from certain pages (admin option).</li>
<li>Styling option for the div element that surrounds the button.</li>
<li>Twitter Button can be placed in different positions in the post – top, bottom or both.</li>
<li>Admin panel language support</li>
<li>Restore option</li>
</ul>
Translations
<ul>
<li>Bulgarian (bg) by <a href="http://www.svil4ok.com/" rel="nofollow ugc">Svilen Popov</a></li>
<li>English (en) </li>
<li>French (fr) by <a href="http://wpchannel.com/" rel="nofollow ugc">Aurelien Denis</a></li>
<li>Italian (it) by <a href="http://www.blog.webgenerate.net/" rel="nofollow ugc">Webgenerate</a></li>
<li>German (de) by <a href="http://dopanic.de.vu/" rel="nofollow ugc">Christian Schulz</a></li>
<li>Macedonian (mk) by <a href="http://wp.mk/" rel="nofollow ugc">Boris Kuzmanov</a></li>
<li>Romanian (ro) by <a href="http://byubay.nodomain.ro/" rel="nofollow ugc">Byubay</a></li>
<li>Spanish (es) by <a href="http://blog.josemi.net/" rel="nofollow ugc">Josemi</a></li>
<li>Croation (hr) by <a href="http://www.mojportal.com.hr/" rel="nofollow ugc">Roberto Bilic</a></li>
</ul>
If you have created your own language pack, or have an update of an existing one, you can <a href="http://www.svil4ok.com/contact" rel="nofollow ugc">send it to me</a>. If you want to translate the plugin in your language, but you don’t know how, <a href="http://www.svil4ok.com/contact" rel="nofollow ugc">contact me</a>, I’ll help you out.
<a href="http://www.svil4ok.com/wordpress-plugins/twitter-button/#installation" rel="nofollow ugc">More information</a> | <a href="http://www.svil4ok.com/wordpress-plugins/twitter-button/" rel="nofollow ugc">Demo</a> | <a href="http://www.svil4ok.com/wordpress-plugins/twitter-button/#screenshots" rel="nofollow ugc">Screenshots</a>

Twitter Button

Twitter Button is a WordPress plugin that allows you to easily integrate Tweet Button in your blog.

WP Twitter Button vs Twitter Button