I have a computer at home, a computer at work and a Treo650 that I cart around with me.
I have used Lifebalance, Entourage 2004, Tasks, Shadowplan and other outliner/tasks combos over the years for extended periods of time, but finally got fed up with the extra work that each of them required.
My job and projects are often quite complex and the need to constantly align tasks and projects under the outliner/tasks computer programs I found to be too much work and not really neccessary.
Finally I just resorted to using Palm Desktop (4.2.1 for Mac) and the palm aps. I find the simplicity elegant and easy and it is the most consistent way to make sure things are in sync on my computers and palm. Its not perfect, but it is pretty darn good and it works equally well on Mac or PC.
I put my projects and focus areas on standard palm memos. Simple projects have just a title, complex projects have an uncomplicated outline detailing the plan, purpose, desired outcome. (I use the datebk5 program on my palm, my one departure from plain vanilla, which extends the 4K limit for memos to 32K on the Treo650). Action items go on standard palm todos. I have something very close to the standard @action item and memo categories that David Allen recommends. During the week, I use my Treo to work with my categoried action lists and calendar and to tweak the more dynamic projects. Datebk5 does do a nice job of orchestrating the palm applications for easy access, I have address on button1, datebook button 2, todos button 3, and memos button 4.
On Friday at mid day, I use the Palm Desktop on my computer at work where I make the more detailed connections between focus areas, projects and todos during my standard GTD weekly review. I look at focus areas, think about new projects reassess old ones, look at what is completed and what needs to be done. I look at projects, think about new next actions, see what has been done for the week and what is coming ahead. Its simple and it works great. Black belt GTD, mind like water, I am finally getting there after a long road.
I have discarded my 43 folder tickler file and instead I use untimed calendar events as ticklers that I can enter anytime I think of one on my Treo (if you use Datebk5, you can use floating events for this purpose, these have the advantage that once they come up, they will keep rolling over to the next day just in case you miss them the first day - and they can be converted into undated todos with a couple clicks - really handy) Anyway, the tickler/event is then out of my mind until the day it comes up on my calendar, and if the event requires me to look at a piece of paper, I trust I can find it in a single folder called tickler in my office.
Input into my system usually consists of just entering a new memo or task on my treo using the keyboard. If I am driving or I am in an environment where I don't want to look like a cyber-geek hunched over my Treo keyboard, I simply use palm voice memo and type it on my computer later. Voicememo is not standard on the Treo, but the Lifedrive version works great on the Treo and can be obtained below. To my knowledge it is the only voicememo application that syncs to the Mac desktop, and its free to boot!
So my advice to those out there trying to find some time new computer program that ties in your big project plans sub project plans, focus areas and todos in intricate detail, think twice, consider simple.
If you have a complex job, sometimes it is better that you spend your brain power on thinking about your projects and doing your tasks, rather than on maintaining the complexities of how the items are arranged on some computer program.
David Allen knew what he was doing when he chose plain vanilla.