I'm reviewing resumes and can't believe that in this economy so many people have such crappy resumes. Address your cover letters to the correct company, for one. Spell check for goodness sake. Follow the freaking directions, as in if it says "send cover letter" write an actual letter, not an email that says "I'd be great for this job". Don't send your "confidential" resume from your work email account. Don't start your cover letter with "I'm not the person for this job but..." Aaaaak, for every hundred crappy ones there's like 0.04 good ones, I'm going nuts here!!!