Materials are what define the appearance of the surfaces of a 3D Model. At its very simplest a Material sets the color of the polygons, at its most complex a material can simulate the surface of an ocean or the way that light passes through glass.
This tutorial uses a custom shader on a material to create a dissolve effect in GLSL. The complete project can be found here.
Sample showing how to fade a model in and out using on a per model basis.
An example of a radial loading circle
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Example project that uses the stencil buffer to create a magic window like effect on a card.
Sample switching on a model materials at runtime.
Dynamically generate normal maps and parallax maps for text