What struck me when playing with it via the 'voice chat/conversation' thing, was a) how brilliant the voice recognition is, b) how brilliant the synthesised voice is, and c) how I was drawn into having a conversation with an AI. I don't know if it's a use case, but what I can see happening is that more and more people are going to start treating the AI as a 'friend'. I think that is quite sad, and will further isolate people from real life conversations, but I can also see how it will fill a need in some folks; especially once the iPhone integration happens.