Like Adam, I use Datebk5 on my palm to manage my calendar. I also have a hard landscape and a soft landscape. Here is an edited excerpt from a post I sent to the GTD_Palm yahoogroup mixed with some new thoughts...
A while back I did this experiment where I loaded my calendar (using datebk5) with very detailed daily plans for the whole week. This included reminders for allergy medicines, alarms to remind me to take food out of the freezer for dinner, extensive dinner menus (that repeated every 4 weeks and had ingredients & cooking instructions in the note field) and I also blocked out times in the morning and evening to take care of the routine stuff and naps (for me). My favorite was the 'Office Wrap-Up' reminder at 3:45pm to alert me to pack it up for the day. The best part about this was that I was home on time every day!
My main concern was that I would get side-tracked or have an emergency pop up and blow the whole plan. This happened on day two or three when my 4 year old daughter burst into the house screaming. She had been bitten by a stray cat and we had to take her to the hospital, which threw off the whole rest of the day and part of the week with follow-up doctor visits and there was also the issue of catching the cat for rabies testing (read the post in the GTD-Palm yahoogroup for the details). My conclusion was that even though the plan got tossed that day, I could still adjust. This is where the advantages of a palm come into play. On paper, I would have had to scribble and erase, etc. With my palm, a few taps will rearrange the undone tasks and the schedule looks nice and clean. I still keep these detailed plans for the routine stuff and plan menus and play time with the kids. I set them all as floats (datebk5 feature) and leave true appointments as appointments. Using the weekly view, I set it to hide the floats so I only see the true appointments or in GTD terms 'the hard landscape'. I also set datebk5 to toggle between these views by pressing the datebk button. So with one press of the datebk button I can 'see it all' and with another press I can see just the hard landscape in a week-at-a-glance view.
As for the task list... I still use it, but most things on it are undated. When I plan my week, I try to pick a few priority or deadline-driven items to add to the calendar. The big key to making this work is to not schedule every hour of the day. At work I schedule mornings pretty tight and leave the afternoons open to catch up, deal with earlier interruptions and knock out next actions from the lists. I usually only add 'priority' items to the calendar that have a deadline and need to get done soon. Once and item makes it to the calendar, it rarely goes back to the next actions list. I also keep weekends less scheduled so we are more apt to relax and go our own pace and be spontaneous. I have reminders on Thursday to sto pand get gas/go to the ATM and recharge the palm/phone/camera, etc. so we can be prepared tp be spontaneous on the weekend.
I find this method to be highly effective for me. The best reminders I have on my palm as floats are reminders to recharge my electronics (every Thursday night), the bedtime reminder for the kids (gives them a 30 minute warning to pick up toys, brush teeth, etc.), medicine reminders, reminders for my daughter's to bring things to school (especially repeat items like their swim suits, soccer uniforms and show-n-tell items) and meal prep reminders (like putting ingredients in the crockpot before leaving for work). These are all floats (with alarms) on my calendar because they need to be done at a certain time or they are part of a routine that happens at a certain time. Nothing will 'die' if they are renegotiated or even skipped but there are so many that they do 'clutter' the screen of my palm. That's why the weekly view of just the true appointments is critical to see where I HAVE to be and what I HAVE to do. The rest is just a flexible game plan. I do try to guard my time when it comes to the soft landscape, but I try to be flexible and use intuition as to whether the current interruption is a truly worthy of me renegotiating my prior commitment. Again I don't schedule the whole day so that I can deal with true emergencies as needed - most of which don't have to be done right that second, but can be completed within the workday during my unscheduled afternoon time.
Hope this helps.
Gretchen