kinda like an online version of http://portableapps.com/suite
its a good idea, basically your 'pc' will be online and you go to a terminal to access it. in a way all your stuff will be located on a server, when you login to the computer you are using, all your preferences and data is already there. it would be like making every computer 'your' computer.
it would only work for countries that have decent broadband though, I think operating systems as we know them currently will be around for a while yet, although there may be a shift toward some software running online (photoshop springs to mind as already having a version of its software online I think)