In Mr. Richan's case, the wall was indeed too weak to sustain that many shelves without any support below it. So instead, he resorted to placing the cabinets on top of a custom-welded base frame. This isn't a bad idea given you still have that sweet floating look, but without the hassles of trying to figure out how to mount everything against a tricky surface.
Finally, he chose a top surface that would match the rest of his kitchen in the other room to complete the modern, contemporary look. Wires, we imagine, wouldn't stand a chance with a little under-cabinet work.
Check out the rest of the DIY project at IKEA Hackers over here.
[Update: Fixed the link. Thanks for catching that guys!]
(Via IKEA Hackers)