EmailYourInteriewer.com has now generated more than 200 letters to employers who never bothered to get back to job-seekers who interviewed with them!
EmailYourInteriewer.com is a free service run by Ask a Manager that lets job-seekers generate an anonymous, polite letter to employers who interviewed them and then never responded to them in any way.
If you've been frustrated yourself by not hearing back from companies after interviewing, why not politely let them know? Go here, and the work will be done for you. (Just make sure to follow the rules.)