Ask HN: What are some good descriptions of how Personal AIs will work?

Aside from what's presented in the film Her, that is.

In a talk from the Singularity Institute, it was said that one won't need to remember things anymore, so the point will be the ability to ask great questions. I'm trying to imagine what that world would look/be like.

I'm also concerned the PAI will be 'wall-gardened', rather than it acting like a virtual you, able to choose from a wide variety of apps and services.