Writing a resume is difficult. Not to mention, you can ask 10 experts in the field and get 10 different answers. Here is a link to an article that makes some excellent points. Specifically, it is not about adding more to your resume, but more importantly what you need to take out.
http://www.forbes.com/sites/dailymuse/2011/11/04/final-cut-words-to-strike-from-your-resume/