RE: What are those fluffy things called?
I love them, especially for hunting arrows. I got a deal on some feathes that aren't too bright in color, but with a white or yellow or chartruse tracer I can see them just fine.
If you want, they are very easy (and cheap) to make. If you prefer fur, pick up a rabbit hide at a shoot or redevous--they come in all sorts of colors. Can probably find one on e-bay or with an internet search. If you prefer feathers, go to a craft store like Hobby Lobby and find the feathers, get a pack of the real fuzzy ones for a couple of bucks, and peel them. You will have some rejects, and you will have to apply your own glue, but they work just as well and cost a lot less.
I use them on practice arrows some, but they don't usually last too long with continuous shooting. They are the next best thing to one of those nocks that light up for me.
Chad