He's an active member over on another iOS forum. He used Gridlock to push his springboard icons to the right and iBlank to create blank icons for his dock. You can you Gridlock on your dock, but he used iBlank since he mentioned it had something to do with spacing out the icon correctly on his dock.
Edit* As for that black transparent part on his background, simply put a slight transparent overlay on whatever wallpaper your using to create that "dock" illusion.