Just a quick post for a knot that I now use almost exclusively for attaching the fly to leader. The Davy knot was invented by Davy Wotton. I used to use an improved cinch knot until I started using this knot. It is quick to tie and strong but what I like most about it is that there is very little waste, meaning you can change your fly many times without having to tie in a new tippet. I highly recommend this knot except when using a fluorocarbon tippet as I have had this knot pull out with fluorocarbon (I think it is due to the lower friction generated when fluorocarbon rubs against fluorocarbon).
Follow this link to see how to tie a Davy knot