iCal is a calendar application that enables you to unify and manage the many calendars in your life. With iCal, you can share your calendars with friends and family, subscribe to public calendars, and view your calendars on portable devices, other Macintosh computers and the Internet.
iCal 1.5.1 is easier and faster use with its enhanced Info Drawer, To Do alarms and notes, and more keyboard short cuts. iCal 1.5.1 also includes improved time zone support and personalized calendar colors.
If you use iSync to synchronize your calendars, you must upgrade to iSync 1.2. Also, if you synchronize calendars across multiple Macintosh computers, you should upgrade all of your Macs at the same time.