This Pinterest plugin will enable your sites visitors to pin individual images on Pinterest, the pin button will appear just underneath every image in the main content.
It gives you the option to chose from the 3 versions of pinterest buttons to apply to your post images.
It also has the option to add a Pinterest follow button to the bottom of your posts.
More features and a major bug fixing release coming in version 1.0
Te puedes descargar este plugin para utilizarlo en tu instalación autoalojada de WordPress.