Links:

Electrical Reference Sites and Basic Theory

bill's electronics reference library
http://www.reprise.com/host/circuits/default.asp

basic theory - electricity, resistance, Ohm's law
http://www.reprise.com/host/electricity/default.asp

Getting Started: Dangers
http://www.reprise.com/host/circuits/voltage_safety.asp
http://www.reprise.com/host/circuits/substance_safety.asp

Basic Tools and Supplies
http://www.reprise.com/host/circuits/tools.asp

components for musical instruments
http://devices.sapp.org/component/

Resistor Calculators:

http://www.ee.upenn.edu/rca/calcjs.html

http://www.dannyg.com/examples/res2/resistor.htm