You could try a phase-change material like what Thermagon makes. That's probably what you are thinking of Brians. It has about double the thermal conductivity of normal paste. It's basically a thin piece of metal, which melts at 60*C and fills all the little spaces on your processor and heatsink / WB. I've got a sample, but haven't actually put it to any real use yet.
BO(V)BZ
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