Here's how to use normal-mapped gradients as layer masks using Blender 2.59. It's a way to quickly splash one texture onto the steep surfaces of your model and a different texture onto the more horizontal surfaces. You can use it, for example, to put a rocky cliff texture onto the steep surfaces of a terrain mesh, and a green grassy texture on the less steep parts. In this short tutorial, we'll use four simple objects to show how the technique works and how to set it up. More at http://millermattson.com/dave . Happy Blending!