It probably depends on your PDA, but I have google calendar in sync with my iPod; I figured out how to set it up by googling for 'syncing google calendar to an iphone'. (Plug in your PDA brand here.) It is very likely to also sync to a Mac, and may even do native ical sync. I really like having my calendar both "in hand" on my PDA and on the cloud, so it follows me around. I leave a tab open to it on all my computer desktops so it can beep at me if I've set an alert.
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