Use a minimum 12 font in either Times or Arial.  Other fonts are hard to read and detract from the resume.

Allow for adequate margins

Use conventional English.  Stay away from multi-syllabic words

Use bullets - not paragraphs and no more than 5 bullets for the 2 most recent positions

Have other people proofread your resume before you send it anywhere.

When given the opportunity, always email your resume with a hard copy following via first class mail.

Send a brief customized letter with each resume

If using a recruiter, make sure they have all your pertinent information (i.e. relocation availability, compensation requirement, position desired)

Go over your resume before each interview.  Whomever is interviewing you probably just did. 

Have printed reference list with you at interview and be prepared to submit it. 

Have several different versions of your resume ready for different types of positions.

Never give the reason for leaving a job (this applies to terminations too).  It is always better to explain it in an interview.

"References Available on Request" is assumed and unnecessary on all resumes. 

Never list references on your resume

Don't omit dates of employment.  Month and year or hire and termination are a must.

Do not date your resume

Do not include personal or physical information.

Never list schooling before college if you have a degree.

Never use "action-words".  Sparked, streamlined and accelerated are passé.

Never include salary information in your resume

Never exaggerate your responsibilities.  If references are checked the truth will come out.