Sam
Here are some good websites with spidder rigging information
http://www.crappiestuff.com/spider_rigging_101.html
http://www.crappiestuff.com/page/page/678512.htm
http://www.in-fisherman.com/magazine...f0403_Crappie/
Here in Illinois we can only have 2 poles out so spider rigging is not a real option for us. I do like to use the longer poles to get away from the boat and put lure into laydowns or brush and when doing a modified spider rig (less poles out) I use 1 - 12 foot pole and one 10 foot pole both on the same side of the boat. have them set for different depths and different lure until find a pattern.
Hope this helps