Write A Great Cover Letter. A great cover letter is hard to find. Not really because they are hard to write, however because people don't know what to create. What are you trying to achieve with your resume's cover letter? Keep in mind, it's just an introduction.
Within most job adverts, you should be able to find the full name regarding person, if you using LinkedIn then its very easy to determine who published the job, while with a bit of research on the web or a simple phone call into the company and you should be able to look for a certain person to send a resume to. If you do find a title, make sure that you use their initial name, and spell the idea properly.