I am quite surprised that no-one is really talking about this.
A lot of people have been complaining about no Wifi Sync or BT sync.
.Mac seems to be a most probable solution to this...syncing Address Books, Calendars and To-Dos via online. No need for doing it at home ...when your mac is online its synced with .Mac and then when your iPhone is online its also synced with .Mac.
Its another way for apple to pull in some more revenue from .Mac as I am sure there are a lot of iPhone users out there for whom this would be a YES to .Mac.
Anyone agree?