Components

Passives

Resistors, Capacitors, Inductors, ...

Integrated Circuits

Op Amps, Microcontrollers, Voltage Regulators, Digitally Programmable Potentiometers, ...

Transistors, Diodes, etc.

Diodes, Transistors are described here.

Optoelectronics

LEDs, photodiodes, optoisolators, LCDs, ...

Oscillator

Crystals, Ceramic Resonators, oscillators, ...

Microcontrollers

Perhaps this material should be at Main Page or maybe not? May have been a one man effort, now dropped. Has a bit of content that looks good.

Sensors

Accelerometers, Gyroscopes, Temperature Sensors, Pressure Sensors, ...

Modules

GPS, Mobile Phone, RF Transceiver, Bluetooth Modules, ...

component manufacturers

Links to homepages, phone numbers, contact info, ...

PCB Manufacturers

contact info, PCB trace width/spacing capability, ...

Suppliers

Good places to buy, numbers to call, people to talk to, ...

Salvage Ideas

Unusual ideas for the fruits of your labor.