"In my view the coming WebOS will not live only on the desktop, rather it will be a web service that lives 'in the cloud.' Desktops will become views into it, rather than the center of it. The desktop PC era is almost over. We are entering a new era of mobility and plurality -- our digital lives will be spread across multiple devices, most of which will be mobile. We will require access to everything, no matter what device we are on.

When a user logs onto any device -- be it a laptop or a mobile device -- they will connect to their account in the WebOS. The local device will synch with their WebOS account to get their latest desktop layout, their preferences, and any new notifications or changes."
-Nova Spivak

Bill Gates seemed to indicate is coming in 2009