Hi,
It is Gutsy Gibbon, but the sidebar and everything in it are screenlets and do not come with Gutsy. You can use them with any distro as long as you have compositing running.
They're very versatile, the sidebar has a fair list of themes. The orange one is the Ubuntu specific one. You can drag the screenlets wherever you want and all can be resized. There are more than in my screenshot as well. gnome-look.org has some listed under Desklets.
They will work without compositing but then you get ugly black borders around everything.
If you run them alongside compiz-fusion then you can put them on a widget layer, which gives you the ability to control brightness etc and even hide/display all widgets with a key press.
Just running the clock (enlarged) at the moment.