paulmac

Include a Twitter @username in your blog post and Twitter Tag will automatically create a link to that users Twitter page and will send a tweet telling them that they’ve been tagged in one of your posts. Twitter Tag uses Tiny URL to include a URL to the blog post in the tweet.
<h3>Feedback</h3>
Feedback and requests for new features are welcome. Just leave a comment on the plugin homepage, <a href="http://www.paulmc.org/whatithink/wordpress/plugins/twitter-tag" rel="nofollow ugc">Twitter Tag</a> or send me a tweet <a href="http://twitter.com/whatithink" rel="nofollow ugc">@whatithink</a>.

Twitter Tag

Link to a users Twitter page when you include a Twitter @username in a post and tweet the user that they have been tagged.

Dachande663

HL Twitter lets you display your tweets as a widget in your sidebar or even browse your entire Twitter history right on your blog. But it also does a whole lot more. You can track multiple Twitter accounts and store all of the tweets on your blog indefinitely (currently Twitter only keep your 3,200 most recent tweets) as well as pulling in any tweets that you reply to for future reference. You can then tweet from your Dashboard or have HL Twitter automatically tweet your new posts with a customisable message.
Twitter 1.1 Compatible

HL Twitter

HL Twitter stores tweets from multiple accounts and displays them via widget, archives and shortcodes as well as auto-tweeting new posts.

Twitter Tag vs HL Twitter