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, ...
Connectors
Batteries
Enclosures
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, ...
Switches and Relays
Turn things on and off
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, ...
Bargains
Get it cheap ( but it it cheap? ).
Free Samples
Free is nice.
Free From Salvage
Dig in.
Salvage Ideas
Unusual ideas for the fruits of your labor.