The Arduino Sensor Kit is a joint electronics starter kit from Seeed and Arduino. It integrates 10 commonly used electronics modules on one PCB, so no breadboard, no soldering, and even no wiring are required.
The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328. It has more or less the same functionality of the Arduino Duemilanove, but in a different package. It lacks only a DC power jack, and works with a Mini-B USB cabl