I use Outlook and Windows Mobile (Palm Treo Pro) in my GTD setup. It's pure electronic. It works great. I think there's a small disadvantage I have in this setup that I'm not sure how to overcome. It would be great if I could add next actions when they appear directly into the system. It would allow to have next actions in system not waiting for daily review to put them in. Now I have to put them into a "collection inbox" (as a recorded message to myself or a hand written note) because it's not very convinient to type in using a keyboard of the mobile telephone.
Here's an example. Let's say I'm driving and have a call. When finished I have a Next Action recorded as a message to myself to move that project further. Then I go to the next call, the next and so on. Even when I'm at a place where I can process the notes I don't force myself to do it because I have a planned time in the morning for processing. So I'm devoted to Doing all day long. Should I have a way to put those recorded Next Actions quckly into the system I would have wider variety of options to choose from. I think paper system wouldn't work in this particular example either but it would work in non-car environment when I can add Next Action into the system right there (just write it down into the context list). But I don't want to go to paper system because of it's limitations and huge maintanance requirements.
How do you add new Next Actions in your mobile setup? Do you care if it takes too much time to type in a new next action?