For one, sales cover letters are pretty much identical to business cover letters in their format or rules, but differ crucially in their content. Your cover letter reflects directly on your ability to "make the sale".
So you"ve got the basics down for writing a cover letter that shines. Address the hiring manager directly (name is spelled right, of course), have a gripping opening sentence, be direct and straight-to-the-point, basically market yourself so that you stand a cut above the rest in that pile of application letters for a job that many people want. You could even add those famous last words in the form of a postscript, really get your foot in the door. Simple enough, right? Something that"ll get you an interview, stat. Well, not if you"re an accountant applying for a position in an accounting firm. If you"re writing an accountant cover letter, it"ll need a little more work and some strategy to get your foot in the door.