POL or Point-of-load seems to be a hot topic these days. Just to be clear, I'm not talking about Internet traffic or construction - although point of load, as well as load bearing capacity are also quite important in those areas as well. I'm referring to power distribution and regulation in electronics systems.
It wasn't that long ago when most things could be run off of +5 volts or +/- 12 volts. That was easy. You just have three power busses and a ground bus. You might have to double some up or take care what is next to what to make sure you have enough current carrying capacity and to reduce noise, but it was fairly easy.