I suppose it depends on what specific cord you are looking at and what you are looking for in a cord.

I found this link useful:

http://www.xmission.com/%7Etmoyer/testing/High_Strength_Cord.pdf

I've collected links of some various cool cords. I have some of the New England Tech Cord in 3mm and 5mm as well as the 7/64" Spectra Cord. It's all cool stuff IMO. This spectra cord is braided, the New England tech cord has an unbraided core. The tech cord is pretty stiff.

Some links to various high tech cord

Also, the Kelty Triptease Guyline has a Spectra core:
Kelty Triptease Guyline

Here is a pic of the Kelty (2nd from top) and spectra cord (bottom):