Xcerion Internet OS/3 (XIOS/3)

This is one of the possible model of web based desktop/OS derived from cloud/utility computing and Software-as-a-Service (SaaS) concepts.

Xcerion called it the world's next free operating system! The video is a demo of new revolutionary collaborative Internet operating system that is delivered as a free service over Internet, capable of synchronizing data between different clients and building real applications in a web browser that works on- and offline. Using XIOS/3 applications can be built in XML in weeks instead of years compared to traditional desktop technologies. Limited beta program started on 30th September 2007. Cool marketplace for finding and publishing applications will follow as well as many applications. See http://xcerion.com for more information and signing up for a beta account. Xcerion slogan is "Software should be free".

This is really cool technology which I think it could be the next big thing in the market.