Here's some shots of the underside of the pegboards. Medium and long zip cords are all I used to attach anything from a coil of extra cable to heavy external harddrives. They come in packs of 15-20 at hardware and home improvement stores.
I daisy-chained two power bars. Each white power bar is connected to a black power bar, which in turn is plugged into a separate wall plug-in as to not blow a fuse.