Fusion forest tutorial. Using Fusions particle system and some images you can create nice forest system to be used for maybe set extensions or matte painting fillers or flyover or...you think of something : )
So you can play along here are tree elements to download.

Fusion Forest Tutorial from Kristijan on Vimeo.

Fake ambient occlusion in Fusion. Using only fusion nodes to build Fake ambient occlusion pass similar to that used by crytek fabulous game engine.

Fusion Fake Ambient Occlusion Tutorial from Kristijan on Vimeo.

MAYA shadow catcher tutorial. A visual explanation of Mental Ray shading network in Maya. Even do this examle is done in Maya 2008 it should work in all versons from there up.

Mental ray shadow catcher tutorial from Kristijan on Vimeo.