I've used the 345 trick like Stanley mentioned for laying out square foundation lines for farm buildings and fence corners using three wooden stakes and some baling twine. Basically you can just take a string as long as the side you want to reference off of, fold it into 3 or 4 segments (as is convenient.. depending on clearance/length of the other side) and then use that to measure the other two sides of the triangle. You can of course use any multiple of those numbers (6,8,10 or 9, 12, 15 for instance).
I would second that all of the Clickspring videos are quite good but I especially enjoy his tooling ones and the recent batch with the Antikythera repro he's been doing a good handful of what might be termed more "primitive" (or less heavily tooled anyway) techniques that I think are really relevant to a lot of folks here interests. I know at least one person is using a copy of his "jam vise" for a stitching pony (for stitching leather).
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