This letter is a more detailed cover letter which runs down some of your qualifications for the reader, indicating some things which may not be on your resume.
1234, Main Street
Boston, MA 02123
04 April, 2005
<Recipient Address Goes Here>
I am responding to your <notice you're responding to> and applying for the position of <position>. Enclosed find my resume, which will detail my basic qualifications for this position.
If you would like more information, or would like to set up an interview, please contact me at <phone number>. I look forward to hearing from you.
Thank you for your time.
encl: <List of enclosed items goes here>