A WebOS is defined as virtual operating system that runs in a web browser environement. Don’t like WebOS? Well, call it OnlineOS, or WebTop if you like.
So, here is a review of 10 functional WebOS’, as well as some additional similar services which show promise but aren’t launched or fully realized yet.
Check out this link for more information:
http://franticindustries.com/blog/2007/06/16/another-10-web-operating-systems-reviewed/