I started keeping a journal detailing each week's weight loss and pictures every 20 pounds or so. I started it just to have for later in my life, to remember; however, I am finding that when I feel like I'm failing (I feel that way a lot, lifetime of diet failure there lol), and when I feel like I'm struggling or not losing enough, I go back and read through and see how far I've come and how much I've lost, even in the last month. If I have a week where I don't lose at all or have a gain (had my first gain of 1/2 pound last week), the journal helps me see the whole story and hopefully keep me from ever giving up in despair, as in the past.
So, do you journal about your journey and how does it help you?