I use my calendar a lot. I also have a running to do list that I keep as a google doc so I can access it on the go from anywhere. Every morning I check that to do list and Monday morning of every week I plan through the week and decide what to put on that list and get a sense of when I'm going to do each task.

I find that by planning my responsibilities, I can more fully live in the present because I don't have to spend as much time worrying and keeping track of things in my head.