iCal

iCal does for dates and schedules what iTunes does for music. You can use iCal to remind you of time commitments, keep track of your deadlines, set alarms, and create and prioritize to-do lists. You can locate events, tasks, and names with the built-in search function; display at-a-glance views of upcoming activities by day, week, or month; and set iCal to send you notifications on screen or by e-mail, telephone, or pager. You can share your calendars online using your .Mac account, and subscribe to other calendars to keep up with work schedules, family and school events, and so on. You can even send standards-based e-mail invitations to contacts in your Mac OS X Address Book.

iCal 1.5.5 gives you more power than ever to manage your life, with new features like the detachable Info Drawer, which shows you all the information about your scheduled events at a single glance; enhanced alarms that not only alert you to critical events but are capable of launching an application or running a script; robust time zone support; keyboard shortcuts for anything you use your mouse for.