Cloud computing, Mashup, and App engine.
It might be interesting to build a 'cloud' instead of building an OS. As time goes by, a TV set is no longer an expensive property. Although a computer ( the hardware plus many software bundled) is not as cheap as a TV set, it certainly will in the near future. Will these clouds in the future become OSes which we are now used to? It might be. It was once the era of hardware, and followed by software. It is now Internet and services.