Quote Originally Posted by Silver Creek View Post
My opinion is that for nymphing a highly visible butt section of the leader can help as an "indicator," but for dry fly fishing leaders should be "invisible."
I think Silver Creek covered this perfectly and I do exactly what he suggested. I use a yellow Amnesia butt leader for nymph fishing and an Airflo poly leader for dry fly fishing. The only thing I'd added is that when fishing very small, low floating, hard to see flies, I sometimes add a small dab of strike putty to the tippet a couple feet ahead of the fly.