+1 on the double sheet bend. It's strong, quick, easy, difficult-to-get-wrong, pretty easy to untie and relatively quick to adjust. I also find it one of the most elegant of knots, which is itself a reason to learn it (and use it at least occasionally).
btw, ridge line lengths are on the comparison chart at hennessy's site: http://www.hennessyhammock.com/comparisonchart.html.
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