Just some more info on anisotropic highlights (people seem to have covered all the other points). "Isotropic" means that something is the same in all directions. On highlights it means the highlight doesn't favour any particular direction over any other - i.e. the highlight tends to be a round spot when you see them on an even surface such as the surface of a sphere. "Anisotropic" means "not isotropic" - i.e the highlight can tend to be bigger in one direction than another. For example, it might be wider horizontally than it is vertically. In real life, anisotropic highlights tend to show up where a surface has long scratches all running in the same direction. Long strait hair has lots of shiny strands all running in the same direction and that's probably the most common anistropic highlight most of us would see in a typical day. Ever noticed how the highlight on a woman's hair can be streched horizontally around the crown of her head, even though the light is coming from a point light such as a light globe? Some metal preparation processes put lots of grooves or scratches all running the same way on the metal and that's another common one. Of course, you can use the anisotropic specular node to do anything you think it looks good doing, but that hair highligt effect is what it was supposedly designed for (it doesn't seem to work particularly well for that though).

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