Presence and Continuous Partial Attention

So this talk at SuperNova got a lot of buzz. I think it worth thinking about more in the context of identity because one of the things we do with identity is assert presence information. We also use multiple identities when CPAing – e-mail, IM handle, login on a website, IRC handle. What are we paying attention to, how are we paying attention and perhaps how can that divided attention be re-aggregated in a meaningful way and integrated.