In carp fishing it's the hair rig, in lure fishing for pike it's got to be braided line. What's the biggest development to have improved fly fishing over the last 20 years?

C&R.when I started fishing everything got clonked on the head.and I mean everything.

Jim

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The Fishermans Friend is the Flirty Fly,Fickle Food for Fleeting Fish.

the bung .............

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WHEN YOU LEAVE THE RIVER, TAKE NOTHING, AND LEAVE ONLY FOOTPRINT'S!!!

THA CAN TELL A YORKSHIREMAN ,BUT THA CAN'T TELL HIM MUCH !!

Sight indicators..............

The visual depth indicators method

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Kevin

Damn you Bruce.....you must have beaten me to that by seconds!!!!!!!1

Carbon Rods, advances in fly line and leader material would be my shout.

I would say...

Carbon fibre rods
Flourocarbon
CDC (dont know how new this actually is in tying but patterns like the shuttlecock are here to stay)

My casting.

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"A glint of sun has warmed the air,The flies will soon hatch out, To lure and tempt from their deep lair, The bonnie speckled trout." SKB tackle supporter. I love Furled Leaders.

I also think the sheer amount of tackle and tying materials available to todays anglers allows inventive and forward thinking fly fisherman come up with new ideas.
If the great anglers of the past had these choices i wonder what they would have come up with.