So, I've seen this brush a lot more lately, on youtube videos, and on images around the web. It's the Nars Ita (pronounced EE-tah) brush made for contouring. Normally, I don't care much for specialized brushes, but this one seems to be great for blending out powder in the small hollows of your cheekbones. The reason why this would help a lot of people with their contour application, is because the bristles, and design of the brush handle help to precisely place the contour product where you need it, and then, the soft, dense bristles diffuse the product, so that there aren't any harsh lines leftover. It's pretty much foolproof contouring. As someone who contours on a regular basis, I'm curious to see how this would benefit me. Unfortunately, because it's such a hot item right now, it's pretty much sold out everywhere, so, if you want one, it's just a matter of stalking different sites until someone restocks it.
NARS #21 Ita Brush, $39, Bloomingdales.com