I need some help!

I know this isn't on the topic of WLS but I was hoping some of you could help me out. There is a job that I really want to apply for and it requires a coverletter to be sent in with my resume, I have coverletter but to me it doesn't get it any more. Does anybody have any suggestions or a great coverletter I could use as a guide??? All suggestions, ideas anything is appreciated, I really want this job. Thanks