After initially writing your resume, go back and use a Thesaurus eliminate the use of ordinary words & the use of the same words over and over. It's amazing how many ways there are to say the same thing.
When providing your work history, provide the month & year for start and end, especially if you've worked there less than a year.
And a pet peeve of alot of my co-workers, use your spell checker and reread your final document to yourself out loud. Sometimes you hear any mistakes rather than read them.