WordPress.org

This plugin gives you a link in your sidebar (or wherever you want it in your theme) that installs a button to the Google Toolbar. The button gives the ability to monitor the RSS feed of your blog from the Google Toolbar. It also adds your blog to the list of possible places to search when running a search from the Google Toolbar.

If this plugin is used with WordPress versions earlier than 2.2 and a widget implementation will be used then the Sidebar Widgets plugin (http://automattic.com/code/widgets/) and Widgetized theme is required.