Whatever happened to the feature where you could see the location of everyone in your address book who has an iPhone on a map? They advertised that functionality a long time ago, but I still don't see it in OS 3. I didn't see it in the big list of features either. Just curious if it's there and I'm not seeing it...and if it is there, how do you use it? Or am I misremembering things...? Didn't they talk about this feature at a keynote address?