Charlie Wood from Spanning Sync, the ‘missing link’ software we mentioned back in November that can keep iCal and Google Calendar n’sync, just let us know that a public beta (version 1.0b11) is now available (zip download link). Getting started with iCal + gCal syncing bliss is simple:
Download the aforementioned zip file
Install Spanning Sync, which runs as a System Preference pane
Enter your Google Account credentials, or go get one (they’re free, and if you already have something like a Gmail address, you’re good to go)
Select which calendars from iCal you want to sync with Google Calendar (and if you haven’t signed into Google Calendar at least once, do so now)
Press “Sync Now”
Sit back and marvel at the wonders of desktop + Google Calendar syncing
I’ve been participating in their private beta for the last couple of months, and Spanning Sync has shaped up pretty well. The ability to keep my desktop synced with Google Calendar has been quite a life-saver for me, and I definitely recommend taking it for a spin, as I couldn’t find any viable alternatives. The one catch that Spanning Sync has run into so far is alarm/reminder syncing. Since Google Calendar only supports alarms in your main, personal calendar, Spanning Sync can’t include this feature until the gCal team shape up and fly right. Still, while I find myself using reminders for some of my key events, I didn’t find this quirk to be a deal-breaker.
As of this writing, a price is yet to be announced, though there will be two plans. The first is an annual subscription rate, while the second is a one-time, lifetime purchase for those who want to get past all the riff-raff. Stay tuned for more details.
From : http://www.tuaw.com/2007/01/30/spanning-sync-announces-public-beta/