Convert2010 has, posted a vid in the 'diy tarp idea' thread the other day:
http://www.youtube.com/watch?v=n2sxtpcP81o
Aardvaark, I'm thinking the same thing about the tape. I have some coming to test, but I plan to use 1" tape running through D-Rings. I'll stick a bit of tape underneath where the tape goes through the D-Ring so the adhesive doesn't stick to the D-Ring itself. Might also put a cross piece of tape each side to strengthen and distribute the attachment load to the tarp.
Be interested to see what you come up with...