Best resume tips

http://www.worktree.com/tb/CL_tips.cfm

http://www.fastweb.com/college-jobs-internships/articles/242-top-ten-cover-letter-tips

http://blogs.hbr.org/silverman/2009/06/the-best-cover-letter.html

All of these sites have the same thing in common except for the last one, he suggests no cover letter for most jobs. Sounds like this guy sees a lot of cover letters. He does share, what he calls "the best cover letters he has read". I liked it, it is simple to the pint ( which the other sites suggest) He offers upfront the years of experience, companies, and which talent will best fit the job he is seeking ( the other sites also cover this) and lets him know he looks forward to speaking with him, on one of the other sites she suggests to let them know you will call, sort of a follow up, I feel this is too pushy, if I got across to you, you will make it a point ot get in contact with me, after all the person hiring is weeding out the bad and only focusing on the good (pile A and pile B).
All in all start the letter out addressed to a specific person, let them know your interested and what qualifies you.  Try not to bore some one with a story.