Skype + iPod Touch + MiFi = iPhone

Now that Skype’s iOS4 app will work in the background, you could plausibly use an iPod Touch and a MiFi (or some other portable WiFi hotspot) to reproduce just about all of the functionality of an iPhone. If you don’t use the phone much anyway, and you want to use the MiFi with other devices (like an iPad) this could make a lot of sense. You would have to figure out how to keep the MiFi charged and under any bandwidth caps, but it seems doable. Not sure if a Bluetooth headset will work, though.