Interesting links I would like to share:

Random
Hacking the PIC18F1320
Resistor Calculator
Hex Converter
Petter’s Robot Dreams
J-Sumo
FirmWarez
Crazycopter
Robotgrrl (Creator of RoboBrrd)

Development
MPLAB SIM
An overview of embedded systems

Suppliers
Pololu
The Robot Marketplace
Digi-Key