Tool Skills
How to Solder
Using a breadboard

Motors
Hacking a servomotor
Hacking a sub-micro servomotor
H-Bridge circuits
All about H-Bridge motor drivers

Sensors
Polaroid sonar range finder
About proximity sensors
Vector 2X digital compass
Dinsmore digital compass

Basic Stamps
Basic Stamp tutorials and help

Surface Mount Components
ARRL Surface Mount Technology Page
Intro to prototyping with SMT

Making PC Boards
PCB FAQ
Toner Transfer Method
DynaArt Toner Transfer
Make A PCB in your Kitchen