Mozilla Prism : Bringing web applications to your Desktop

"Prism is designed to create a better environment for running your favorite web-based applications. Much of what we used to accomplish using an application running locally on our computers is moving into the web browser. Thanks to advances in web technology, these apps are increasingly powerful and usable. As a result, applications like Gmail, Facebook and Google Docs are soaring in popularity. "

http://prism.mozillalabs.com

G.ho.st - Hosted Operating System

" Virtual Computer Features

Your desktop from any browser
3GB free file storage
Office suite & web apps built-in
Secure , no installs & updates"

http://www.g.ho.st/