WP-Tweetbox gives you a widget to show a (fully customizable) Twitter-searchbox in your sidebar. De searchterms are automatically taken from your post-tags. If the widget is shown on the frontpage (thus having no tags), you can specify a custom title and custom searchterms. If your post doesn’t have tags, the same custom searchterms are also used!
For more information or to download this plugin, please visit jacobfresco.nl