I came across a "commercial" for one of those wiring systems. (I don't know what you call them in English, but there are about a million brands and designs. All proprietary, of course.)
Anyway, this way of wiring commercial premises differs a bit from the American way and I thought someone might find it interesting. The clip is in Swedish but I don't think the language matters.
Isn't it amazing how fast they install things in a commercial? I'd like some of that cable that appears of out nowhere, ready for connection in the box... http://www.schneider-electric.se/boa/flash/install/index.html
(I had trouble creating a link. Please tell me if it doesn't work)