fetherwayt
This may depend on what your operating system is. On Windows, and if you own a version of Office that includes Outlook, Microsoft Outlook is good. For using multiple computers, Google Calendar is excellent as a calendar, but it's task list feature is pretty cheesy. If using Windows, Palm OS Calendar application is very good, though dated. The calendar itself is great. The contact list is less great. You get it by installing the free downloaded Palm Pilot software (but you don't have to use a physical Palm Pilot gadget).