Applications - WebReferee
WebReferee is a web server utility designed to eliminate unauthorized references to content on your site. See http://maximized.com/
Note that this can also be done using Apache server configuration options
Today's Top Story... a picture of a lake...
Heh, heh, heh... we're such good pirates we've stolen this from Maximized Software's demo site.
Image source: <img src="http://demo.maximized.com/protect/lake.gif">