Someone else referenced the Blake's Hitch in another thread. Just gave it a shot and it holds fantastic in my paracord experiments. Even simpler than the Prusik since you don't need a loop.
I've still had no luck with the Klemheist except when the tied with smaller utility line to the paracord.
Any sliding/gripping knots I've used so far on my Amsteel whoopie and on my Kelty Trip-tease guy line have been tied with loops of 2mm utility cord. They are very light and grip well as Prusiks or Klemheists. I haven't tried them on my Dynaglide ridgeline yet, but will soon.
I used to like 550 cord (parachute cord), but the more I use it, the less I like it. It's heavy, stretchy, and acts weird with some knots. Any cord I buy now is the "Power Rope" sold by Campmor in the climbing section. The 2mm and 3mm (paracord size) is .15/ft. They offer it from 2mm up to 9mm and I use almost all the sizes for various camping, hiking, kayaking, hunting and canoeing needs. It's a great product.
Last edited by desmobob; 10-08-2010 at 20:03. Reason: spellin'
You wqnt the ability to slide under high winds for your tarp. Better to retighten a prussic than rip a tarp