I second the prussik suggestion. If you don't want to use biners with them you can use small trail stick toggles. Stick the prussik loop through the tarp loop, then hold it in place with your toggle. Leave the prussiks attached to the line when you take it down. No need to keep retying them every set up.
I think the drip lin length is not important. The objective is to provide the water a path of least resistance. It will stop flowing down your suspension once it hits the drip line, then follow the drip line downward. If you use a longer line, like almost to the ground, the drips are less likely to be blown toward your hammock if it's windy. I don't think that's a common issue though.
Last edited by shumway; 06-19-2011 at 21:05..
Reason: Speling mistakes