Although your résumé is definitely important, the cover letter can also be a make-or-break factor. Before you even get an interview, your application will have to impress the recruiter or hiring manager, so perfecting your cover letter is key to earning a face-to-face meet.
Three Cover Letter Pet Peeves (+ One Thing You Should Never Do!) | Three things I hate, one thing that will kill your chances of getting hired, and four ways to ensure your cover letter doesn't have any of them. [lindsaygranger.com]