My wife, two kids and I each have our own MobileMe email addresses and our own iOS devices. We independently sync our own email and calendars. Currently, we can each purchase games and share them by downloading them for free on each device. You simply take your iphone and switch to the other family members iTunes account before you try to download the game and it lets you re download it for free. Then, once the game is on your iOS device, you can download the updates when they become available by entering in the original purchasers username and password. I can't imagine that it will be any different. However, this currently doesn't work with music but it appears that this is about to change when the new cloud service is released.