The eyeOS Web Desktop is a Virtual Desktop Interface that is built using Cloud Computing Concepts. This Operating System is Primarily written in PHP, XML and JavaScript. It has 67 built in Applications and Tools for Anything from Word Processing to Event Management.
A demo of this Virtual Desktop Operating System is available for public testing
HERE.
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When I first saw this interface, it reminded me of the type of Operating System that Google wants to build with their Chrome OS: "An Operating System that uses the Server's Processing Power instead of the user's PC. With this type of Operating System it wouldn't matter if you have a 10 year old PC with little to no RAM and very little processing power. You could still have a fast and enjoyable computing experience!
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Feel free to try it out and post comments on eyeOS or any other Virtual Desktop you have tried that uses Cloud Computing Concepts.
Pete