I didn't feel that the dark version of his theme was dark enough. Everything but the panel was the same as the Light version. I've tweaked the css a little to provide a dark styled dock, workspace selector, and overview background (the color that fades in over the wallpaper).
Random note, but I was tempted to make these changes because I was blinded on my first trip to the overview screen after applying the original. Light wallpaper + light overview color = burnt eyeballs. Especially coming from the default gnome-shell theme.
Install Instructions I've only included the modified css file. You'll have to fetch the rest of the theme here.
After installing the original (dark) theme based on the instructions, simply replace gnome-shell.css with the file contained in this .zip.