DesiPundit

Lorelle shares a useful Wordpress plugin that injects a “digital fingerprint” manually into your posts which is seen only in your feeds, not in the post itself.

The Digital Fingerprint Detecting WordPress Plugin works by adding unique content to your feeds. If your feed content shows up on any blog that is patrolled by Google BlogSearch, Feedster, IceRocket, BlogPulse, Sphere, Google, Yahoo!, and MSN, the Plugin searches for the unique phrase and displays search results with that phrase in the Digital Fingerprint panel.

Digital Fingerprint — detecting content theft at MaxPower