iPhone Calendar Sync
The Google Instructions for selecting which Calendars will sync to your iPhone are really really terrible.
These setup instructions tell you to visit http://m.google.com/sync/ on your iPhone to select your calendars. But when you visit that address on your iPhone, it tells you to visit http://m.google.com/sync/ on your computer--which, hilariously, takes you back to the original instructions.
Google is totally punk'd-ing us.
If you would like to *actually* select which calendars you would like to sync visit this address on either your phone or computer.