Graynomad:
VIN, do that pin give the same level as the input?
VIN is the same everywhere, if you have 12v on the barrel jack you'll have 12v on the header pin. That said, if you're drawing a lot of current it would be better not to run it through the PCB.
Wops, I haven't read it as VIN, I have read it as vcc :), thank god I have used only usb power, and breadboard psu so far 