I'm a dinosaur I know. I've been a Palm user since the late nineties and still am today, although I was finding it more and more of a chore to keep separate calendars - all I did on my Palm was read my vast collection of ebooks. Anyway, it looks like that might be changing. Pimlico Software, the makers of the Datebk Palm app, which has held my schedule for the past ten years, have been busy beavering away on a new PIM app called Pimlical. It has all the power of Datebk 6, and indeed more, and best of all it integrates .ical format calendars, meaning that Google Calendar that I actually see most often can now be on my Palm (provided I hotsync regularly). Best of all, my Datebk stuff can also be in my Google Calendar - all those people's birthdays, anniversaries and regular appointments. Pimlical is a bit "oldskool" in appearance, with little of the flash of Google or Apple, but since I don't even really need to use it to act as a conduit to my Palm (just starting it up, letting it sync my Google calendars and shutting it down is enough) it means I can just carry on using Google or the Palm and only need Pimlical when my appointment is complex.
In fact, although Pimlical is buyable for roughly 20 bucks, I'm not even sure why? I will buy it when I have the cash to help the gorillas.
Have a look at the screenshots for yourself: http://www.pimlicosoftware.com/pimlicalscreenshots.html