An excerpt from reCareered's 4/9/12 newsletter that discusses why employers don't focus on your responsibilities ...
We were taught how to write a resume that focused on our responsibilities.
This is traditional job search 101.
This made sense for a long time, from WWII until 2007, when there were candidate and skills shortages. When there were skills shortage, it made sense to focus on your skills.
However, when a shortage of skills turned into a shortage of jobs in 2007, focusing your resume on your responsibilities stopped working.
Here's what hiring managers are looking for today, instead of responsibilities: