This is awesome news! The video included on page to demonstrate it, but essentially he demos starting the calculator via command line locally, and then running it with "broadway" and showing it works the same in the browser! What is the biggest issues with Cloud computing these days? Control over your data! If this develops well enough, then the Gnome-based apps we've grown accustomed to (Abiword (word processor), Gnumeric (spreadsheet), Cheese (webcam), Gimp (image editor), Evince (document reader), Pitivi (video editor), Rythmbox (music player), etc.) will be available remotely from any system (Windows, Mac, Linux, etc.) using HTML5! If it takes off, there is also the chance of other applications following suit; Banshee, F-Spot (uses GTK#, but could be modified), Shotwell, etc. To give you an idea of how much could be effected, take a look at the official Gnome sponsored projects from the Gnome Project Listing page.