Sync services

Sync iCal with Google Calendar
You can set up iCal to sync events with your Google Calendar. Changes to your events will be reflected in iCal automatically.
Sync iCal with Google Calendar

Sync Address Book with Google Contacts
If you sync an iPhone or iPod Touch with your Apple Mac, you can also sync your Google Contacts to the Address Book application.
Sync Address Book with Google Contacts

Access Gmail from Mail app
You can get set up the Mail application to access your Gmail account and use it to send email from your computer.
Access Gmail from Mail app