Write an effective cover letter that will score you an interview. Remember with cover letters there is no "one size fits all." Here are some samples that you may find useful:
Explain why you are sending a resume.
Don't send a resume without a cover letter. Don't make the reader guess what you are asking for; be specific: Do you want a summer internship opportunity, or a permanent position after graduation; are you inquiring about future employment possibilities?
Tell specifically how you learned about the position or the organization
A flyer posted in your department, a web site, a family friend who works at the organization. It is appropriate to mention the name of someone who suggested that you write.
Convince the reader to look at your resume.
The cover letter will be seen first. Therefore, it must be very well written and targeted to that employer.
Call attention to elements of your background
Education, leadership, experience - that are relevant to a position you are seeking. Be as specific as possible, using examples.
Reflect your attitude
Personality, motivation, enthusiasm, and communication skills.
Provide or refer to any information specifically requested
In a job advertisement that might not be covered in your resume, such as availability date, or reference to an attached writing sample.
Indicate what you will do to follow-up.
Asking about the possibility of an opening - don't assume the employer will contact you. You should say something like, "I will contact you in two weeks to learn more about upcoming employment opportunities with (name of organization)." Then mark your calendar to make the call.