I do a ton of writing. 3 pages everyday in the morning and now and again in my sketchbooks. It's good to always have a sketchbook on hand to keep those interesting ideas and notes. I also carry a small moleskine weekly day planner in my back pocket where I write down movies, and websites and things to check out when I get home or on the net, even books to take out of the library.
I also have a habit of writing on my hand.
Ballpoint works great, Sharpie not so good an I noticed my copic's tend to wear off by the time I get home erasing any notes I've made throughout the day;(