Based on the tutorials off the arduino website, some simple exercises. I don't have a breadboard or any wires on me right now, so anything more complicated is off-limits until I go to radioshack or order from digikey or whatnot.

Simple blinking LED, done with a simple delay statement.

Pulse Width Modulation dimming of two LEDs.
This didn't work until I realized that there are separate PWM input/outputs. Pins 3, 5, 6, 9, 10, 11 are able to do PWM as well as receive analog input. Interestingly, the Arduino website only states 9, 10, and 11 as PWM pins...