Since this is in the "weather protection" forum, I don't want to limit this discussion to tarps. All over / under quilts and bedding should come to mind as well.
I just have a rectangular tarp at the moment. And my six tie-out straps aren't long enough for me stretch it any farther away from me at the moment. But now that I've had to get in and out of this thing for a couple nights, it will definitely be solved when I get home in a couple weeks. I actually enjoy it so close to me, because it keeps me warm. Vacationing North and didn't expect it to get so cold, really. Just packed one backpack and left to meet some friends who have been camping out for months now.... but I don't want to return home as soon as I originally planned.
I'm really looking for the lightest "packing" underquilt and tarps that are easy access, ability to open/close ends to hopefully solve condensation, and, again, be the lightest "packing" (brand? or polyester?)