Do not tabs, use the spacebar instead. Make everything left justified. If you want to indent a sentence or center a heading, use the spacebar. Avoid decorative, uncommon or fussy typefaces. Use White Space.
Scanners use white space to recognize the breaks between topics.
Use plain English. Minimize use of abbreviations, unless they are keywords or industry jargon. Continue to use cover letters, include keywords in it, and refer to the specific job posting. One page resumes are no longer the rule. Three pages, maybe four, are about as long as an electronic resume should be.