Always list most recent work experiences first, and work your way back. Your resume is your personal marketing tool. Potential employers want to believe that you are as good as you say you are, so tell them. Also, every individual has a wide variety of unique interests. The enthusiasm associated with your interests can easily be translated into additional marketable qualities that woul be highly appealing.
Correct spelling is VERY important.
Keep descriptions short and to the point. White space is appealing to the eye. It makes the resume look short and sweet. When a potential employer has a stack of resumes to go over, his or her eyes will go to the easy ones first. Underlining also makes your resume easy to read.