BlenderRendering

Blender

• Node Editor tutorial - http://www.blender.org/cms/Blender_Material_Nodes.743.0.html
  Preview render, 3D window
• Previews can also be rendered in the 3D window, this is a scalable Panel accessible with the hotkey Shift+P.

Render Baking

http://www.blender.org/cms/Render_Baking.827.0.html
http://blenderartists.org/forum/showthread.php?t=82705