Here is how I achieved the interface that you see there.
I started with the standard Gnome interface. Then I deleted the bottom panel, and dragged the top panel down to the bottom, then set that panel on auto-hide. Then I created a new panel and put it on the top, and added to it the Show Desktop button, the Window List, and the clock. Then I added transparency to the panel.
For the Controls / Widget theme I have Glossy P, for the Window Border theme I have Clearlooks 2, and for the icon theme I have Glossy-Glass.