Screen Readers for GNOME and KDE?

mingthemerciless asks: "The company I work for is developing accessible solutions for the visually impaired. Right now we are working on (yet another?)a screen reader for windows, but a linux version is on the drawing board...Linux screen readers like Speakup and Emacspeak either are console only or create virtual desktops. Is it viable to have a 'what you hear is what is on the screen' screenreader like JAWS on the current Linux desktop environments Like GNOME 2.0 or KDE 3.0?"