a wood shader to put the rings/texture along the wood to make it look like wood?  I am doing the fruit tutorial over at Carrara Lounge and one of the steps is a procedural shader to make the plate look like wood with texture.  Not sure if this will help

http://carraralounge.com/index.php?topic=194.msg448  the current thread and links to the video

the original thread http://carraralounge.com/index.php?topic=177.msg420#msg420