iCal

[Wailer]

I like Google calendar a lot. Aside from having access to it wherever I have internet access, it syncs seemlessly with my Palm Pixi over wifi or 3g in the background. I may be wrong, but I seem to recall that iCal won't sync easily with anything but an iphone.

I still fire up iCal and have it "backup" my Google calendar data but my phone also makes a good backup when I'm not near a computer or am offline.

Lastly, google provides a free CalDAV server so I can share for free.