gooseGrade allows your readers to become citizen editors.
This plugin is no longer maintained, due to the gooseGrade rebranding. gooseGrade is now known as Editz (http://www.editz.com/). This plugin has been replaced by the Editz plugin (http://wordpress.org/extend/plugins/editz/). If you are using the gooseGrade plugin, we recommend you to upgrade to the new plugin by removing the gooseGrade plugin, and installing the new Editz plugin. (http://wordpress.org/extend/plugins/editz/).
Allow your readers to become citizen editors. gooseGrade is a free service that allows your readers to post spelling, grammar, factual, and other errors straight to you. After you or any other wordpress admin approves the edit, the gooseGrade plugin will automatically fix the error. It's like magic.
You can learn a bit more about it by watching this video: