Grasshopper Tutorial Intro - http://designreform.net/2009/04/rhino-grasshopper-intro-part-1/
basic intro - tabs, series & range functions. setting up for controlling inputs
Intro 2
http://designreform.net/2009/04/rhino-grasshopper-intro-part-2/
Assigning series and range functions to points and fields in Rhino
