Google Calendar officially comes to Apple's iCal:

Google on Monday formally announced full support for the CalDAV protocol along with the release of a small piece of software for Mac computers that lets users easily link up their Google Calendars with the iCal application.

I’m trying this now and will report. Now if I could get my Gmail contacts into Apple Mail, I’d be really happy. There’s a third-party method of syncing calendars and contacts but I’ve had trouble getting it to work.