What are the obstacles to using iPod Touch as a VoIP phone. Now that the SDK is released, if I find a SIP phone application, what else do I need? Does iPod Touch have a microphone and a speaker like the iPhone? It would be great that, from a end user perspective, it works exactly like an iPhone except the phone call would be VoIP over Wi-Fi. It would be cool not put on headphone buds and attaching a protruding Mic etc. Thanks for any tips, pointers and opinions.