Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
Like Spence, I like Matthews' technique. It really stands the wing up and keeps it there. I typically only throw one wrap in between each bunch for most flies, and that seems enough. Al Caucci has always been a fan of very thin bodies, as the real bugs aren't typically as fat as some comparaduns are tied.