if Apple added this feature, there’s a good chance I’d throw a party. Other party worth additions: a notification panel (android/webOS style), the new (really good) Google apps [i.e. Google Voice, Maps w/ Latitude and Navigation], push Gmail support built-in (not via Exchange), an Apple built iChat or BBM-like app, and lastly (I’d probably go nuts for this one): video-chatting.

ps: OceanObservations does some other great iPhone mock-ups too.