Jim's
Tutorials

Spring 2012
course
navigation

interesting articles

Arduino:

Knock arduino example sketch: link This seems like a simple, cheap way to turn piezos into sensors.
Using LDR's with Arduino: link

attiny:

Servo library for attiny 45/85: link

Processing:

Augmented reality with processing (!!!) link

Electronics stuff:

Transistor switch: link
3d model of pcb and components: link