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

mclarty

Twitter Hashtag Feed Widget creates a simple, clean Twitter feed of a specified hashtag. This widget is specifically designed to render a lightweight widget that can be completely styled by the user through CSS.
<h3>Custom Theming</h3>
All widgets have the CSS class .widget_twitter_hashtag_feed_widget for uniform styling across all widgets on the site.

Twitter Hashtag Feed Widget

A sidebar widget that creates a simple, clean Twitter feed of a specified hashtag.

GG Twitter vs Twitter Hashtag Feed Widget