Make it error-free.
One spelling or grammar error will create a negative impressionist. (See what I mean?) Get someone else to review your final draft for any errors. Then review it again, because these rascals have a way of slipping in.

Make it look good.
Poor copy quality, cheap paper, bad type quality, or anything else that creates a poor appearance will turn off employers to even the best resume content. Get professional help with design and printing if necessary. Many resume writers and print shops have desktop publishing services and can do design for you.

Be brief, be relevant.
Many good resumes fit on one page, and few justify more than two. Include only the most important points. Use short sentences and action words. If it doesn't relate to and support the job objective, cut it!