Robert Baer wrote:

The silver conductive epoxy is extremely conductive, and even tho i
never measuresd the resistivity, i would wager that it is better than
copper if used properly.

Here are some examples of silver epoxies:
http://news.thomasnet.com/fullstory/460221
10^-3 ohm cm

http://www.mgchemicals.com/products/8331.html
2*10^-2 ohm cm

http://bondline.net/datasheets/2072.pdf
4*10^-4 ohm cm

http://bondline.net/datasheets/2080.pdf
5*10^-3 ohm cm

http://bondline.net/datasheets/2111.pdf
2*10^-4 ohm cm

http://bondline.net/datasheets/2120.pdf
5*10^-3 ohm cm

Copper:
http://www.lehighton.com/AppNotes/Cu...llization.html
1.68*10^-6 ohm cm

According to these sources, copper is about 100 to 10,000 times as
conductive as silver filled epoxy.