Thanks for mentioning iCal. I have ditched eveything else and find that iCal has everything I need for GTD.

It’s a calendar, to-do (to-do’s can be sorted by calendar, too, by the way) list, tickler file (just put “See File under “file name” in the notes field) and, well, everything else that GTD requires.

Here’s the reason I forced iCal to work for me: I don’t carry a PDA, just a sony ericsson phone, and everything that is in iCal, including tasks and alarms, are synced with my phone quickly via iSync. I even have a script to open iSync, sync them, them quit iSync, all by hitting Shift-F8. So I just tap the hotkey when I get to my mac and leave it, and all my stuff is current all the time and very portable, always in my pocket.

Another great thing, it doesn’t just import from iCal to the phone, it syncs them, so when I’m out and I need to add a task, I can do it shorthand on the phone and it will sync to a calendar called “Inbox” in iCal when I sync up.

I would love to use fother fun GTD software, but alas, I don’t need to. If you carry a syncable phone with you everywhere, I highly recommend tweaking iCal to work as your GTD system.

Did I mention there’s tons of little apps and even widgets that let you see your iCal stuff at a glance without bringing up iCal? Very nice.