Gtk+ 3.2 will let you run application in a browser thanks to the new HTML5 gdk backend. You will be able to run any GTK app, remotely (or on the same computer), using a web browser.
It is not final. Everything does not work. It is only supported in Firefox 4.
I am not quite sure how this is helpful, but it is pretty cool none the less. What do you think? Is this another step toward cloud computing?
Check it out in action in this video recorded by Alexander Larsson: