I'm designing a system that will power a 2B using an OKI-78SR-5/1.5. It's a switching regulator, pin-for-pin compatible with the classic 7805 linear regulator. I'll be using a 15V PSU (for a motor) and once connected it will stay connected. So after some fairly basic testing I'm just planning on being careful to connect it the right way round. This only does 1.5A, but do you really need more than that on the Pi PCB? If you've got further significant 5V power requirements I'd be very tempted to run them separately -- I've crashed a Pi a few times by connecting a not-very-big capacitor to the 5V line using the official 2A PSU, so inrush currents are something to be wary of.
Chris H
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