I don't see a way to sync with iSync -- but maybe someone will build it.
... integrated with Gmail so you can add events mentioned in messages to your calendar with just one click.
.... simple to see calendars from your friends and family, or calendars you find with the built-in calendar search tool, right next to your own calendar. You can choose to share as much or as little of your own calendar, too.
.... You can turn any event on your calendar into an invitation just by adding the email addresses of your guests. They can see and respond to your invitation, whether or not they use Google Calendar themselves.
... Event reminders by email and text message to your mobile phone
... supports the iCal standard
... can add customized Google Calendar event reminder buttons to their pages, letting visitors quickly add copies of events to their calendars.The lack of Safari support is disappointing, but as I recall Gmail started out without it as well.