Don't have the camera with me right now - but this is what the pin-layout on the bottom of that PSU connector looks like. A lot more complicated than the top is.
I'm guessing that the longer pins are grounds, the one on the top is +12V, the big one on the bottom here is +5V, and most of those small pins are for feedback from the regulation circuit back into the PSU, perhaps also one for the PSU fan RPM's to be monitored as well. Reading the label on the PSU (there is a closeup pic of it in that zip) says that the PSU only puts out +12, +5, and -12V, so that reguilatoin/load-balancing circuit must be building the other voltages from those.
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