Good article in NetworkWorldFusion on 'presence' as a rising killer app for collaboration:

Some say the numbers suggest that presence is well on its way to being that killer app.

"Just like in the late '90s when the No.1 thing on IT agendas was to Web-enable applications, I think the story of the next decade will be adding presence to applications," says Francis deSouza, president of IMLogic. "Every application can be made smarter and more efficient with presence."

The article acknowledges but doesn't address the need to manage your presence. And--I would say--your identity Sometimes you want to be 'working guy.' Sometimes you want to be 'home guy,' or 'hobby gal' or 'working on this important project that has nothing to do with anyone else person.'