WordPress

Plugins or Widgets for WordPress  

• MyTwitter -- MyTwitter allows users to display their most recent Twitter status updates (tweets) via function or Widget. Includes options for number of tweets to display and formatting.

• Simple Twitter List -- adds a link that passed to Twitter the details of the page or post that you're currently reading.

• TwitThis -- add a "TwitThis" button to your website, or blog. Wordpress plugin included.

• TwitterUpdater sends a Twitter status update to your Twitter account when you create, publish, or edit your WordPress post.

• Twitter Wordpress Sidebar Widget a WordPress Widget plugin for your blog as an alternative (with more options) to the badges provided by Twitter.

• Twitt-twoo Twitt-Twoo is a simple little plugin that will allow you to update your Twitter status right from your WordPress blog's sidebar. By DeanJRobinson. Support forums.

• Twitter Tools This plugin creates an integration between your WordPress blog and your Twitter account. Pull your tweets into your blog and create new tweets on blog posts and from within WordPress.

• Twitterdoodle This plugin allows you to create automated Twitter mashup posts based on keywords or keyword phrases. A great way to add relevant, timely content to your blog on a regular basis. 
• WordPress Dashboard Twitter is a handy WordPress plugin that turns your Dashboard into a Twitter client, conveniently displaying mentions, direct & sent messages and favorites plus allowing you to update your status from within your WordPress Dashboard.