University of Kentucky
Elecroscope Lab
This site is actually a lab from the University of Kentucky Electrical Engineering Department. It is an excellent experiment that can be done at the high school level.
University of California
University of California Berkeley: Charging an Electroscope by Induction
From the U.C. Berkeley Physics Lecture Demonstrations website. A thorough description of an activity in which a charged metal plate is used to charge an electroscope by induction. Complete directions and a diagram of the equipment and...