For most people a healthier diet and more exercise are top on their new year's resolution list. Instead of following a fad diet think about incorporating healthy eating and exercise as a lifestyle.
The athletic foodie blog is a great resource for healthy eating and tips on making it a permanent lifestyle instead of a temporary change.
To help keep track of what you are eating I like www.fitday.com, http://nutritiondata.self.com, or if you have a Training Peaks account logging it there. Tracking your daily food helps to make you more mindful of what you are eating.