Organize your calendars
Group related calendars so they appear together in the Calendars list.
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Organize your To Do lists
Reorder your To Do items by dragging them in the order you want them, or sort them by due date, calendar, or priority.
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Print using the new by day, week, month or list printing layouts
Choose how you want iCal to print out your calendars and To Do lists in the new Print dialog (choose Edit > Print). You can print all your calendar information as a list, or in new day, week, or month view formats.
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Search for events, To Do items, or both
Choose whether you want to search for an event or a To Do item using the search field pop-up menu. You can also search for iCal events and To Do items from the Finder using Mac OS X Spotlight.
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More easily manage your invitations
When you make changes to an event, you can easily send the updated event to anyone invited to the event by clicking the new Send button in the event's Info drawer. The new Notifications box gathers responses to your invitations and invitations that are sent to you.
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Change events into To Do items or To Do items into events
Just drag an event to your To Do list to change the event into a To Do item, or visa versa to change a To Do item into an event.
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View everyone's birthday on a calendar
Have iCal create a calendar with birthday events for each person in your Address Book that has birthday information. Simply select the "Show Birthdays calendar" checkbox in iCal preferences.
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Use spoken commands to control iCal
If you turn on Speakable Items in the Speech pane of System Preferences (in the Apple menu), you can use spoken commands to create events, add alarms, and more. For information on using spoken commands, search Mac OS Help (in the Finder, choose Help > Mac Help).