A simple iron rod and glass tube with an incandescence gradient using the new blackbody node for Cycles in the upcoming version of Blender 2.69. It helps you to use black & white textures literally as heat maps to apply realistic incandescence on any object. Unlike the blackbody node, the custom incandescence node group also does the lighting for you.
May be useful for smithing scenes or glowing fantasy weapons, for example.
Note: the blend requires version 2.69 or higher to work properly! It has been created with blender-2.69-testbuild1, but it should also work with the upcoming final builds.