Since the iPhone has been hacked to allow 3rd party apps, it shouldn't be too long before the iPod touch is hacked as well... There are several Web based skype like options that would work on the iPod touch as log as you could get sound in. But that is where the problem lies, the iPod touch's audio jack is out only, so you would have to connect a mic through the dock connector. Talkety is an example of web-based VOIP. Apple can't block the web-based VOIP systems so they should run pretty smooth. As for a 3rd party app, its just a question of time before one is released.