I have been trying to hire a team of 10 in the next 5 months which means that I have seen a fair amount of resumes and cover letters. There is one that stood out from the rest. It made me laugh, then sad for a bit, and then laugh again. I will highlight what was wrong with this persons approach and then identify why it was wrong, and what I was actually looking for.
This person actually applied twice (I will call her Kim). Once in 2010, and again in 2011. The position in 2010 was for a web developer, and in 2011 it was for a system admin (two completely different jobs). The resume was exactly the same and the cover letter as also exactly the same. That was problem number 1.