TUAW is reporting that someone has successfully attached a mike to the iPod Touch and make it able to receive and record audio, suggesting that a iPod Touch-based VoIP device is possible, which will (in theory) eliminate the need for the iPhone.
To me this all sounds like the not-so-strong cult following of people who modifies their 1.6 TS Imprezza into aa Imprezza WRX, despite the fact that it will cost a lot of time and a lot more money than if you buy an Imprezza WRX in the first place.