Drop.io just announced that their collaboration service is now a real time Web application. I got word from them that this amazing new stuff is powered by XMPP via Strophe. They have certainly added a lot of elbow grease, passion, and magic on top to make this possible, but this is a terrific example of what I envision with XMPP powered Web applications.
To get the full effect, I highly recommend watching their real time demo screencast.
They have this to say about the technical details:
Each drop is assigned its very own chat room on our Jabber setup, and whenever a user views the drop, Strophe automatically logs the user into the drop's chat room. Whenever an event such as a file creation occurs, drop.io's application servers send an XMPP message to the drop's chat room describing the event.
This is not far off from the structure of Chesspark, and shows just how powerful a few XMPP technologies can be when combined well. One neat side effect of this is that they will have a public API for free that has robust support in many languages already. Maybe some day they will enable Drop.io features in arbitrary chat rooms as well!
Congratulations to the whole Drop.io team on a successful launch of a very cool product!