Twitter Tools
This plugin integrates your WordPress blog with your Twitter account allowing you to send new blog posts to Twitter as a tweet and and vice versa. Cross-promotion of a blog posts to Twitter is fairly common and can be automatically achieved with Twitter Tools. You can also create digests that consolidate all of your tweets. Also, the plugin is entirely pluggable and can be extended just like WordPress itself.
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Archive your Twitter tweets
With Twitter tools, you can automatically have it create a blog post for each of your tweets. Use it to cross-post your witticisms or store them as your own private tweet archive. You also have the option of creating a daily or weekly digest post with your tweets if you don't want a separate post .Post a tweet from WordPress
If you spend a lot of your day in WordPress you have the option of posting directly from your WordPress dashboard screens. On top of that, using the sidebar widget, you can post immediately from your blog.OAuth Support
Twitter Tools 2.4 includes support for OAuth (as opposed to basic authentication using your username and password).