Hello, there, little guy. The new Arduino board's just been outed, and it's not kidding about the 'nano' part. The Arduino Nano 3 boasts an ATMEGA328, breadboard capabilities plus Mini USB support ...

The Arduino Nano and Uno are equipped with very similar processors (the chip that essentially serves as the brain of the board). The Nano features an ATmega328, while the Uno sports an ATmega328P.