I found the pinout, so I'll probably mod this to add a USB +5VDC connection because not only am I using one of these to power my S1 but the design of your board is so nice and the power supply so good, that I will be using one as a bench test power supply and having a good +5VDC supply to keep small MP3 players charged, or a phone charged, will be handy.

I do car stereo work and sometimes you have to bench test things but amps require a minimum of 30A when they get up into the higher power range.  Accessories that use USB (like the little Sansa MP3 player I use) need 5V to at least keep the batteries charged, so tapping into those pins will be good.