This is a chart I used to help me keep focused on my startup (it starts in January 2011 and ends in February 2012).  I would put a star next to each day that I worked on my product. I got the idea from Jerry Seinfeld; his mantra was "Don't break the chain". He used it as a way of forming good habits by making a stride towards a goal every single day, even if it was only a small amount of work that he did.