Random urge got me to looking at the thermal conductivity of various elements, and why they aren't used in computer manufacturing.
Found this: http://usapplieddiamond.com/thermal-management/
Chemical Vapor Deposition (CVD) diamond heatsinks.
Which made me think.... Would there be any benefits to say.... coating the inner and outer surface of the heatspreader on modern CPU's/GPU's with this to aid in heat removal? From what little I know about vapor deposition, it leaves a thin uniform layer of the substance on a substrate. Seems like it would be a (relatively) cheap way to boost the efficiency of heat removal from your processors.
*Edit: Requisite extra reading:
Wiki article on Thermal conductivity
Thermal Conductivity of metals
And a quick list of common (and not) heatsink materials:
Code:Thermal Conductivity (W/m K) Aluminum: 205 Copper: 385 Silver: 406 Diamond: 1000