I took a career portfolio class when I was going for my Associate degree (I’m finishing up my Bachelor’s right now, done in October, yes!). The class was very good, it covered how to write a resume, cover letter and put together an entire career portfolio and demonstrated how to handle yourself in an interview. The teacher was mad cool and now he’s the dean of the school. He always said to use “Dear Sir or Madam” over “To Whom It May Concern.” +1 for JaysGreenLX on the good call.