Easy, works great -- and then from iCal, it's an easy sync w/ your iPhone or iPod. From each separate Google calendar, go to Calendar Settings then scroll to Private Addresses at the very bottom. Click the iCal option. A long string of letters and numbers will appear, ending in .ics. Copy that long line to your clipboard. Then switch to iCal and Subscribe. Paste the string in and you're off! You'll have to Refresh All thru iCal periodically to keep iCal current with Google. I have six "personal" calendars for work, Kiwanis/Optimist Club meetings, vacations, birthdays, special events.......
I've used Google Calendar to manage my entire life for over a year and it's the greatest thing ever, especially now that it integrates with my iPod touch so easily. Love it!!!