Another good WordPress plugin:
Quote:AntiLeech helps prevent content theft by sploggers.
AntiLeech does not prevent the splogger bots from accessing your site. It produces a fake set of content especially for them that includes links back to your site (and mine, too, ok?) and sends it only to them. When they steal this content, it appears online just like normal, except now you've turned the tables on them and have provided them with useless conte
http://redalt.com/Resources/Plugins/AntiLeech