Here are some links I have found yesterday/today that illustrate the power of the modern desktop.
Real time blur
Youtube video demo of XGL touchscreen
Xgl on touchscreen part 2
mockups of effects possible with Compiz/Xgl
Compiz mockups part 2
LowFat - file manager mockup
Here is a screenshot of a GTK theme/engine taking advantage of the new GTK mac-menu bar and the DYnDYn dynamic shading engine.
I think this is enough for today. Hope someday we will have all this working!