Ars reports that buried in the iPhone 3.0 OS is evidence of voice control features that are codenamed "Jibbler," as well as synthesized voice responses from the phone, a la iPod shuffle.

It looks like Jibbler is an "enhancement" to the iPhone's SpringBoard app—the essentially invisible app that manages the homescreen and launches applications—and might be controlled by the headset. Unlike the shuffle, which lets your computer do all of the synthesizing work to talk to you, the iPhone would handle it in real time, apparently.

Hello, voice dialing—and if the voice control APIs make it to the SDK—voice Twittering, no more separate apps required. [Ars]

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