University of Wisconsin
University of Wisconsin Madison: Writing Center: Writing Cover Letters
Offers a tutorial on writing a cover letter, including sections on the format, what to include in a cover letter, organization, and questions to guide your writing.
College Grad
College Grad: Cover Letter Checklist
Are you wanting to create a perfect cover letter? Follow this checklist from CollegeGrad.com to make sure that your cover letter is professional and complete.
Online Writing Lab at Purdue University
Purdue University Owl: Workplace Writers
Purdue University offers this great resource for students and teachers looking for sample cover letters.