Now webmaster tool carries author status which you can find in the lab section of webmaster tool which represents how often your content is showing up on the Google search results page.
http://searchengineland.com/google-webmaster-tools-author-stats-104781
Re: Author Status and Webmaster Tool
Seems like a very good addition to the tool. This is going to be really useful in catching those people who are just copy pasting your content for their sites or their blogs.