Helicopter + guide wire, then pulled the main cable across using the guide wire, according to the commentary with one of the engineers. The main cable weighed in at somewhere around seven pounds per foot
I'm still not clear on how they pulled it, or how it was anchored, particularly given what they said about the side where he started from being it's own little island of sorts. Would have like to seen more of the setup / teardown rigging procedure. Maybe there's some 'behind the scenes' footage available?
Edit: ElectricTVonline just posted this today, covering some of the challenges the laborers undertook in the setup and rigging.
http://youtu.be/3HeuJ3BH7s8