What really keeps me going is my "before" picture, where I was around 155lbs (although to be honest, I'm pretty sure I was pushing 170).
Keeping it with me (yes, in my purse), reminds me where I was and where I could go again if I am not mindful of my choices. I can't pull out my debit card without seeing the picture. Do I really need to buy that ice cream cone? $2 doesn't really phase me, but the picture does.
And of course, progress pictures keep me going.
Maintainer 2004-2009/3 Pregnancies/Maintainer 2013 - Present