If you use google apps and an iPhone or iPad you have probably tried to add other calendars to your in app calendar application. A very simple way to do this is to use iphoneselect. Iphone select allows you to select the calendars from a webpage and then configure your iPad or iPhone app to sync with them
Google APPS: https://www.google.com/calendar/hosted/YOURDOMAINNAME/iphoneselect
Change YOURDOMAINName to the appropriate url mine is “jimiz.net”.
Gmail: https://www.google.com/calendar/iphoneselect
You will then see your available calendars to sync with, the same selection you have in the gmail web application. This great little url can quickly configure your calendar.
I recently configured my cousins google apps account and allowed him to sync the other team members.