Cal, I've sold it on to fund some work with zpacks.
But hung, I use ~10-12' for ridge lines, and about ~6' for guy lines.
Reason for 2 lines is ease in my case, I find it simpler and more adaptable after using
The single line when I was getting started. It seems to cater to those who rig the tarp
Above their hammock suspension lines. Being that it follows the same principle as the hammock
Itself (30* angle), I find it very easy to set desired height, ridge line tension, etc.
I recently watched this video again, which has some interesting tarp rigging ideas...
http://www.youtube.com/watch?v=C24ZfphQzrQ