Paul Boutin at Slate review YouOS, which can be best described as a complete computer in your browser window:

Your browser window turns into a desktop of its own, with sub-windows for e-mail, chat, and Web browsing. There are also links on the YouOS desktop for a sticky-notes program and a rich-Text editor. But these programs aren't on your hard drive-they're running somewhere in the vast unknown Internet.

YouOS is the fledgling startup of four recent college grads with a bit of angel funding. Its simplicity makes it a great demo. Anyone who logs on can instantly spot the big idea: You don't need Windows! You don't even need a PC! You can login and work from anywhere using any gadget with a screen and a keyboard.

I have seen a (limited) Mac Desktop in AJAX already a while ago. YouOS is so much better an is very intuitive and fast. It's all there what I need browser, shell and photo tools. Some AJAX sites have already shown the potential to be a MS Office replacement (not now but in some years from now).

YouOS is cool - I hope it finds a parent company that s able to nurture the great concept and provides a revenue model.

(via Emergic.org)