twitter.com – Everybody’s using it and everybody’s talking about it, it became one of the best ways to promote your blog, works or any other idea. twitter is also a great tool using with wordpress. here is a list of the top Twitter plugins and themes for wordpress.

Themes

Fresh Tweet: WordPress Theme Inspired By Twitter

Demo |  Download

P2: The New Prologue

URL |  DEMO

Plugins

Twitter Friends Widget
Twitter Friends is a WordPress plugin that displays your Twitter friends in your sidebar in the same way that they appear on your Twitter homepage.
URL
Twitter for Wordpress
Twitter for WordPress displays yours latest tweets in your WordPress blog.
Download

Twitter Tools
Twitter Tools is a plugin that creates a complete integration between your WordPress blog and your Twitter account.
Download
Twitter This
allow your readers to share your blog post at twitter.
Download

Twitter Widget Pro
A widget that properly handles twitter feeds, including @username and link parsing. It supports displaying profiles images, and even lets you control whether to display the time and date of a tweet or how long ago it happened (about 5 hours ago, etc). Requires PHP5.
Download

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Excellent post by smashing magazine – 15 Useful Twitter Hacks and Plug-Ins For WordPress -  http://www.smashingmagazine.com/2009/03/04/15-useful-twitter-plugins-and-hacks-for-wordpress/

And the rest Twitter plugins from wordpress.org – http://wordpress.org/extend/plugins/search.php?q=twitter