I got an IPad a while back, and something was always bothering me with it. It had this really nice looking calendar application that was useless because it only showed one of my 5 google calendars.
Turns out Google tought of that. You need to navigate to their Google Iphone Calendar Selector and select which calendars you want to display in your IPad.
Suddenly my IPad’s calendar app got a lot better. Now if I could only find some way to get a better mail application as well