Skype first--My detractors on this site (and there are many of them) are quick to point out that Skype is available on many devices, including just about any laptop with a built-in camera and any smart phone or tablet. What they miss is that Skype isn't generally available with a wide-angle camera lens, isn't generally available in the living room, and isn't generally very easy for grandma to use. The next generation Xbox cures all of these issues, and lets anybody call anyone else by merely talking to their always connected Xbox. Again, I don't KNOW that this is going to happen, but it makes a lot of sense that it will. Why is that a killer app? Because if you're a 16 year-old living at home, it's an easy hook to sell your parents on the next generation Xbox by convincing them that the entire family can call grandma every night and say goodnight. I think it's even a compelling reason to buy a console for grandma, so she can video chat with her grandkids, and it conveniently gives the 16 year-old something to do when he's forced to visit grandma. I don't know for sure WHY Microsoft bought Skype, but this seems as logical a reason as any. I think that living room to any phone globally is a lot easier than PC to phone, and I think that people with families overseas or far away will be interested in making calls easily (and cheaply) via Skype if the service is included in a plug and play device like the next Xbox.