Cover Letters

I thought this article was helpful in explaining cover letters. I thought it was kinda weird that the examples seemed to be so boastful. The example letter seemed to be really arrogant almost, especially the PS part. I thought using a PS was unprofessional. I mean, I know when applying for a job it's important to play up your talents and qualifications, but isn't it also important to be yourself? I'm not the type of person that likes to brag about accomplishments so writing a cover letter is going to be difficult for me. It just feels so unnatural. I wish I had a secretary or something that could do it!