Craythur Web OS
Once the site has loaded you get an immediate wow factor, partly due to the fantastic wallpaper and partly due to the cool glassy effect on the login dialog.
Logging in is simple as the user and password for the demo are provided. After logging in you are presented with a desktop complete with icons that can be dragged and dropped on the page. Double clicking the icons opens a window that can be rolled-up or maximised and vice-versa.