I used to keep lists in a very organized calendar/day timer. When I went back to school, I took it with me. Most of my fellow students were fresh out of undergrad and made fun me for carrying our that last vestige of my 9-5 life. I really haven't used a real paper calendar since.
Now, I use emails as a record of who wants what, what I need to do, etc.
And I kind of miss my lists.