A useful link I got thru Blender Artists forum:
http://blenderartists.org/forum/show...utorial-Series
It links to 7 tutorials on cycles
http://wiki.blender.org/index.php/Do.../Render/Cycles
is the wikipedia manual
and a blender Cookie link :
http://cgcookie.com/blender/2011/09/...render-engine/
Have fun !
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