Web inching towards actors?

I learned about the new HTML 5 postMessage API recently, and it struck me that we are ever so slowly inching towards actors on the web: now all windows in a browser (including separate tabs and iframes) are communicating sequential processes.

Now, if Alan Kay had had his way, every node in the DOM would be separately addressable (i.e., have its own URI) and would probably itself be an actor.

The OO dream?

Signed message-passing! Multi-language, multi-implementation services! Actor-based distributed computation! Is this the OO dream?

[A] portable implementation of Termite is underway. ... The implementation will also support signed message passing... [A] system will only be able to receive messages from trusted sources... Will this be a way to re-unite the Scheme community? Is it a better approach than providing a common package infrastructure?

From Dominique Boucher. Heady stuff. The mind reels at the possibilities. We'll see.