In the just released SDK beta 2, iPhone Alley found a string within a preference bundle that reads: "Syncing with this Dot Mac account will turn off syncing for other Dot Mac accounts and delete any existing synced data." This suggests the possibility of wireless syncing for non-Exchange users.
This would be awesome additional functionality for both the iPhone and for .Mac. 2.0 really can't come fast enough.
And note to Chad: How about an article on why the iPhone really needs immediate release in Canada? Please? :)