I have been maintaining a couple of journals to keep track of my progress. I have now come down to using a little journal book that I keep in my back pocket. It is about a 3" X 5" book that has many lines on it which allows me to keep track of each day with the food that I eat and the weight that I weigh. I have evolved from that and am liking it.
I use to weigh myself every day and now I am waiting for every Friday to see my progress. With jogging in the morning everyday, I hope I see more results. I have also been watching my caloric intake to also help with that.
One place where I will not skimp out on tracking data and that is my weight lifting. I need to track the weight and intensity of all of my exercises so I don't forget and where I can see myself push myself to get past the plateaus.