I fall in and out of the habit, but if you're in a high-volume-of-email job and don't always keep up with your email throughout the day, I find making sure I've

I fall in and out of the habit, but if you're in a high-volume-of-email job and don't always keep up with your email throughout the day, I find making sure I've read all of the day's emails a good way to end the day. Besides missing fewer emails (in an office, people will usually be like "hey, did you see my email?"), it also gives me a chance to stop thinking about programming-related tasks and provides a little sense of accomplishment at the end of the day which is sometimes lacking when said programming-related tasks aren't going well.