My takeaway is that it's a bit like how your smart phone will wrap in your IM and SMS messages to a person in the same list interface.<p>I'm guessing this will be something where you select a person you know, and up pops a list of all of the interactions you've had with them in one stream.<p>Seems like it might work, if it's seamless enough. Saying it's "email" or an "email killer" is being short-sighted -- it's giving you a stream for an individual.