This is not a standard ATX power supply. This is a custom-form-factor Micro ATX power supply.

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I thought that might be the case from the size of the box it came from and was wondering if it even has all the voltages necessary to run the Miniscule MoBos that're cropping up.

This one appears to use standard ATX 1.x pinouts, though. Based on what I can find, it is either ATX12V 1.2 or ATX12V 1.3.

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I've got a couple of first rev ATX Mobos w/ISA/PCI and AGP1/whatever on board.

I know it hasn't got nearly enough power for my PEx board, but it'd be easy to hack it into a lot of different Macs for runnin' ubuntu and the like on modern low power boards.