This allows you to create a fan page like button that has none of the fancy stuff normally that exists: stream, profile thumbnail, name. Button only.
Download the plugin
Extract the contents of facebook-simple-like.zip to wp-content/plugins/ folder. You should get a folder called facebook-simple-like.
Activate the Plugin in WP-Admin.
Go to your settings area and click the "Facebook Simple Like" settings page link, and enter the url for your fan page then you can use a widget in in your theme, or simply the shortcode: [facebooksimplelike]. It's that simple!