With plenty of developer looking to develop the next killer Voip App for the iPhone, there is plenty of belief that iChat will make an appearance on the iPhone in the next software update, iPhone 2.0.

What does this mean?
With iChat on the iPhone, you would be able to make voice or video calls over a wi-fi ntwork directly to other iPhone users or iChat users.  All they would have to do is bring iChat to windows to have one unified solution.

Of course this is all speculation… But, Apple does hold the ability to grow the popularity of the iPhone even greater by finally providing a solution for voip on the iPhone.