Hey Zen, Watch that Troutmaster, he's buttering us up pretty good calling us "Great fly fishermen" and all that buttery crap. I think he's after some of our secrets.
Regarding the Daphnia fly, a friend of mine actually tied one. His theory (which ain't bad) is that often the daphnia school up in a dense cloud and that's when the trout gorge on them. His fly was a glob of lime green african goat dubbing (I think) with some lime green Krystalflash through it. No particular shape just a glob.
I doubted it would work so I never ask him about it.