RE: Source for Puglisi material
As Peter said, the stuff is called Sea Fibre, and is available everywhere now (I get mine from Urban Angler in NY, but Orivs carries as well). The trick is to alternate high-ties and low-ties. The hanks should be VERY thin. One patchof Sea Fibre should last you a lifetime (or at least many seasons!) And yes, it's virtualy indestructible.
Some other tips: some people like to trim the whole fly to give it shape after completing. I think this gives the fly an unnatural look. Better to get the right length hanks when you tie it in. I've found that if you leave the ones towards teh head fairly long, it gives the head a nice sloping shape. If you cut them short, if gices the fly more of a forehead -- depends on whatyou're imitating.
Also, guys at UA showed me that you can greatly reduce fouling with longer flies if you put a tiny amount of Flexament between your fingers and run it through the fibers just past the bend of the hook. This stiffens the fibers and prevents them from wrapping around the hook.
I love this material -- the flies look great and they hold up really well. You can also make very small flies with this stuff too.