I love square tarps.

I always manage to get my 5x8's pitched really tight - rain sounds like a snare drum on them. it's soothing to me at night for some stupid reason <img src="/forums/images/graemlins/wink.gif" alt="" /> Anyway, I always find the little micro-mini aluminium cord tensioners , you know the kind with a hole and a notch that loops back over the line and you can slide up and tighten.. they weigh next to nothing in the ultra small size and work really really well for snugging everything down.. I know in theory you are supposed to need tarp tensioners with silnylon however using what I use I never have.

I'll find the camera and take a pic of them if ya want.