iPhone/iPad/iPod Calendar + Google Calendar not all calendars sync...

I had a problem with my Google Calendars. Some would sync with the Calendar app on my phone. Some would not.

I tried different things, but apparently its buried in this web address:

http://m.google.com/sync

Go there, find the device you'd like to edit, and find the calendars you want to sync.

No fuss, no muss.