Print on one side only. Resumes which have been folded, stapled or otherwise mutilated will not scan well. These new systems search for applicants by using key words or phrases. So in order for your resume to have appeal in your chosen career field, use the jargon of the field. While sections which highlight experience, education, languages, technical skills and other categories are important, emphasize specific skills and achievements.
Nouns are also more distiguishable than action verbs.
Remember, the rules differ for unusual or different looking resumes. The fancy graphics used to catch an employer's eye will only confuse a computer, so keep it simple.