An old salty showed me that addition to the fisherman's knot (ie the second loop) about 20 years ago while trolling on the alberni canal. He used almost exclusiviely plugs and thats the knot he used. Why....simply because that knot could be positioned at various spots on a Tomic plugs U shaped eye in order to create a more aggressive action. Like I said, my preference is to have the jig ride parallel to the bottom, I guarantee you that the Trilene know and the 2 loops around eye of the jig will hold that allignment better than any knot that only has a single loop around the eye.
I think I started fishing jigs for coho more than 12 years ago. For salmon, my favorite material is either marabou or flashabou (tinsel). Pink/purple marabou is by far the most versitile jig/color (chum, coho, steelhead), I like yellow marabou for coho, I tie a green/blue and green/purple flashabou jig that work well on chum and coho. Pink white has also been a good combo, chartruese/black, the popsicle pattern (purple red orange i think), etc. While palmered marabou jigs like the ones pictured here are good, I like tieing oversized wooly bugger patterns onto my jigs (ie marabou tail, chenile body with hackle palmered over the body). When experimenting with jigs, I simply looked at the fly fishermans arsenal and enlarged and copied the patterns onto jigs as previosuly mentioned a wooly bugger and christmas tree seemed to be the two that worked best for me but I am sure there are others out there!
I also cast my own jig head an I haven't noticed a difference in fishability between bare lead heads and colored ones or lead and the plated shiny beads some jigs use.