I do exactly this, but with the sticky notes application. I find it easier to shuffle and tweak the raw text than moving around and editing discrete todo items, and I have it covering the next 2-3 weeks at any given moment with longer term stuff noted at the bottom. I've also started carrying around a small notepad that acts sort of like a buffer for the todo list, both incoming items that occur when I'm not at the keyboard and outgoing data/thoughts for meetings. It feels more like a natural extension of my memory than any todo app I've tried.
For awhile at work I used Windows' sticky notes extensively. My wallpaper at the time was an image of old fence boards, so the two combined to make a little kanban on my desktop.
