Aaron D. Campbell

A widget that properly handles twitter feeds, including parsing @username, #hashtag, and URLs into links. It supports displaying profiles images, and even lets you control whether to display the time and date of a tweet or how log ago it happened (about 5 hours ago, etc).
<a href="http://aarondcampbell.com/wordpress-plugin/twitter-widget-pro/" rel="nofollow ugc">Twitter Widget Pro</a>

Twitter Widget Pro

A widget that properly handles twitter feeds, including parsing @username, #hashtags, and URLs into links.

steve228uk

Social Stream takes your latest posts from Twitter, Facebook and your WordPress blog to merge them into a single feed. This can be displayed anywhere on your site with a shortcode or series of helper PHP functions.

Social Stream

Combine Twitter and Facebook feeds with WordPress posts to create one Social Stream

Twitter Widget Pro vs Social Stream