It's important to create solid, measurable goals. Something vague like "I want to lose weight" just won't really work. "I want to lose 30 pounds, weigh 135, and have a 24 inch waistline" is solid and measurable.
It's so easy to become addicted to weight loss. My goal is to achieve a healthy weight (for my height and frame, that's between 120 and 140). I've set my goal at 135 so that I have "space" for backsliding and weight gain. I understand that I'll work at maintaining a healthy weight for quite some time to come.
I intend to do this through both good nutrition and fitness.
What are your goals for the new year?