How to Determine a Copyright Violation
First, visit ChillingEffects.org to see if your work is protected and what to do about it. There are resources to report the violations, as well as information on copyright laws as they pertain to the digital world. All content displayed on the web must comply with the Digital Millenium Copyright Act (DMCA). If it does not, you may need to report the violator or send a DMCA takedown request.
Initial Steps To Report a Violator
Secondly, if the blog or site that has violated your copyright is displaying ads by Google, you can report them to Google AdSense. Google will then revoke their access to make AdSense money with your content if they agree the site has violated your copyright. Whether they are using Google or not, you can also do a Whois Lookup and report them to their domain registrar. This may cause them to lose their domain or to take down the violating content.
DMCA Takedown Request Form Letters
Below, I have included examples of form letters that I have used to request action regarding my own content that has been used without my permission. I am not a legal expert, just a writer who has also experienced unpleasant situations in which someone else has published my work without the rights to do so.
Before using these form letters, please be sure to read all of the information provided at ChillingEffects.org, as well as Copyright.gov. If you feel my form letters will suit your needs after studying the copyright law, feel free to use them and edit them as needed for your personal use.
These form letters may not be sold, redistributed, or otherwise published without my permission. However, they can be used for your personal needs as necessary. I make no claims as to the legal validity of said letters. Use your own discretion.
(FORMS ARE BELOW)