I recommend this article for a number of reasons. First, the man knows how to spell "anisotropic," which is more than I can say for myself. Second, anisotropic filtering is Very Important to image qualitymore so than the various forms of anti-aliasing we've come to know over the past year or so, in my book. Anisotropic filtering is also a form of anti-aliasing, in fact, but it's much smarter about how to handle texturesand it makes things sharper, not blurrier, as a rule. Rev's screenshots will visually demonstrate the crazy huge difference between, say, bog-standard bilinear or trilinear filtering and full-on, razor-sharp, crisp-as-the-mountain-air anisotropic filtering. (Open those pictures in windows maxed to full screen so you can switch between them and see how it changes.) Impressive, no?