I use lots and lots of loose leaf 8.5x11 printer paper and different colored pens. I keep a stack of this with me all the time. The top page is a to-do list and

I use lots and lots of loose leaf 8.5x11 printer paper and different colored pens. I keep a stack of this with me all the time. The top page is a to-do list and notes to myself. The other pages are other notes on things I've been working on recently. I continually add new items and cross them out as they get done and when a page is full and has all the items finished I toss it out. Same with my other notes. So how swamped I am or how on top of things I am varies with the stack of paper I carry in my bag. Doing things on paper also gives me time to focus hard on a problem away from the distraction of a computer.