Apollo IM - iPhone Native Instant Messenger Application
At this moment the Apollo IM only supports AIM chat protocols with limited features. You can see your buddy list, send, and receive messages. Not much options available yet at this moment such as notifications.
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The Apollo IM is pretty much in early Beta (more like Alpha) and does not allow you to stay connected to AIM when you exit the application to go back to home screen. It's a good start and I hope we will see more iPhone native applications.