I have an iPod Touch. The back plate claims the model is A1213. However, Settings->General->About claims that the model is MA623LL. I just upgraded the iPhone OS for iPod Touch to version 3.1.3. According to web surfing, I close apps by holding down the Home button for 5 seconds. When I hold it down for much longer, however, and nothing happens. If I just click the Home button, I do go back to the home menu, but if I return to an application, its the same page that I was looking at before. It almost seems like it never closed, just got put in the background. I know I can hit the device with a club by holding down Power and Home buttons, but I hear that's not recommended. I also know you can hold down power until you are presented with a slider to power down, but I'm not sure if this is any different from holding down Power and Home. Comments? P.S. when I post this message, I have a checkbox for polling this thread. What does that mean?