From Cool Tools, animated lessons on how to tie all kinds of knots. This site is so much better than those utterly useless static diagrams in most sailing books. Using different colour ropes really helps as well.
Learn to tie knots
Joe Drumgoole
Copacetic 
Joe, thanks for that link. If that site existed when i was a young scout, I would have aced all the knot tests that our scout leader put us through. As was, i did crap.
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