If nothing else, the fact they've taken the effort to overlay right/left arrows on the image during a mouseover event, yet still do a full reload to show the next image is instructive.

Any particular reason this was linked to other than general interest? I'm not seeing anything revolutionary...

Why not just link to the xfce page? http://www.xfce.org/about/tour

They have screenshots there too, where you can see what the default theme looks like (or whatever people look at screenshots for). And they're on one page.