Seen the DiggBar on Digg.com? Add a similar feature to your WordPress blog by creating a navigation bar for all external links outside of blog. Also
A very simple bar for outgoing links in your posts.
Diggbarred stops all DiggBar requests to your site, instead displaying a message of your choosing.
Frame Free is a plugin to remove any frame created by Digg, Facebook, Google Images, Ow.ly and any other third party services.
This plugin prevents your blog from being put in a frame.