iCal and Address Book using iSync through .Mac on OS 10.2.2
It rocks - and does everything you asked for - including syncing with your Handspring.
plus iCal and iSync are free from Apple !
However .Mac and OS 10.2 is not free - but I still recommend it.
You do need .Mac in order to get the remote syncing to work.
http://www.apple.com/ical/ http://www.apple.com/isync/ 