Personally I think ATX power supplies and DVD drives are pretty great for parts.
ATX PSUs contain transformers and inductors which can be used for wire salvage (not to mention the thing's actual wires). There's plenty of capacitors, resistors, and voltage regulators depending on where you look.
DVD drives contain stepper motors, DC motors, potentiometers, LEDs, and powerful lasers. (Powerful enough to delete your eyeballs in nanoseconds. Be careful.)