Components
Passives
Resistors, Capacitors, Inductors, ...
Integrated Circuits
Op Amps, Microcontrollers, Voltage Regulators, Digitally Programmable Potentiometers, ...
Transistors, Diodes, etc.
Optoelectronics
LEDs, photodiodes, optoisolators, ...
Oscillator
Crystals, Ceramic Resonators, oscillators, ...
Connectors
batteries
Enclosures
Sensors
Accelerometers, Gyroscopes, Temperature Sensors, Pressure Sensors, ...
Switches
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, ...