There is a white board that sits next to my desk, on it I catalogue my book progress. I'm a very visual person, so I know that I need this kind of motivation. Note the goal of "75K", "Sleep!", and of course "Beer!"
Every time I shut down for the night, I'd write down my word count. Sometimes I'd hide the word count by placing something in front of the lower left hand corner of my screen so that I wouldn't be tempted to look. Because you can bet that every time I paused to think of the right word or phrasing... my eyes would shoot down the left to see how I was doing.
Do you use any incentives or visual signs of progress during a big project?