Keep the cover letter short as possible. I used to post an ad on Monster on Friday afternoon and get over 300 e-mails by Monday morning. I would ignore the cover letters and look at the resumes first. If the resume looked good I might go back and read the cover letter looking for specific tasks and project accomplished. I eventually had an assistant screen the e-mails for me.
Are you responding to an ad or just fishing? Have you had any previous contact with Mr. Anderson? Do you know if they are trying to fill a position and what their criteria are for that position (job description)? Try to match your resume and cover letter to those criteria if you know what they are.