the sixteen-twenty loop
Just bought the march/april issue of american angler, which has an article by E. Richard Nightingale about a knot he developed called the sixteen-twenty. He claims that it is "as strong as or marginally stronger than the Bimini twist" .. "Properly tightened, the sixteen-twenty loop is virtually a 100 percent knot."
Haven't tested it myself yet, but from the diagram it looks like a _very_ simple knot to tie; similar to the duncan loop but actually looks easier.
Speaking of simple & strong, i just talked to a flyshop guy / guide who says he always uses a perfection loop to tie flies to tippet. I recall there was a loop knot thread, now wondering if that was just about duncan loops..