I am actually experimenting with using a daily task diary (ala Mark Forster) as part of my GTD system. I have my projects, waiting for, areas of focus, but I now program in the next actions I think need to get done into the task diary. I don't really need context lists since most of the time I have a phone and email with me. Part of why I am doing this is to see what I am actually getting done in a day. Yes there is some re-writing of things that don't get done. I find it brings some urgency and pushes some things to completion since you want to get them done and not re-write things.