Garth Gutenberg

Lets you display a twitter feed in a sidebar widget. 
Caches last successful tweet retrieval and only updates if it successfully gets a new list from Twitter. 
Practically every element has a unique class so that it’s highly customizable via CSS.
There are various configuration options including:
<ul>
<li>Title</li>
<li>Twitter Username</li>
<li>Max Tweets to Display</li>
<li>HTML to override the View All link</li>
<li>Time Placement (whether or not the timestamp should appear before or after the tweet)</li>
<li>Time Format (uses PHP’s date() function for formatting)</li>
</ul>

GG Twitter

H. Peter Pfeufer

This Plugin will add a twitter timelina as a sidebarwidget to your wordpress-blog. This timeline is provided by twitter as you can see <a href="http://twitter.com/about/resources/widgets/widget_profile" rel="nofollow ugc">here</a>. 
Now you dont need to copy and paste the code from twitter with your settings anymore, just install the plugin and set the options.
Features
<ul>
<li>Easy install</li>
<li>Panel for easy configuration</li>
<li>Customisation via CSS in settings</li>
</ul>
Available Languages
<ul>
<li>English</li>
<li>German</li>
</ul>

WP Twitter Timeline

Add a sidebarwidget with your twitter timeline to your WordPress-Blog.

GG Twitter vs WP Twitter Timeline