They have all kinds of info. Check this out:
http://www.ms.ornl.gov/researchgroup...lectronics.pdf
Here is the main webpage:
http://www.ms.ornl.gov/researchgroup...foam/foams.htm
Dosn't seem like they have made to much progress since 1997 though as the thermal conductivity seems to be less than aluminum. Not sure why that first link claims way better than copper...