Can you do physical? I have found that carrying a pen, and a packet of sticky notes in my pocket at all times is the way to go. when I get home, Ill peel off the sticky, and organize it. I do it a little different though and organize things by "backlog", "Today", "tomorrow", "this weekend", "hold", because I find it suits the way I work as an individual (ie, I save stuff like washing the car for the weekend etc)
i keep trying physical/written/etc to-do systems, they continuously fail me unfortunately... but thanks for sharing, it sounds like a great method!
I've only played around with it for a few minutes, but it seems feature rich with a free account option. See http://kanbanize.com/