This is a handy AVR programming cable that incorporates both the 10-pin and 6-pin ISP programming interfaces.
With the GPS Shield you can add GPS functionality to your Arduino.
Just need to make some motors move with your Arduino? Here's a simple way from SparkFun - the Ardumoto!
The Voice Shield™ (VS) is an analog audio shield for the Arduino that allows you to play audio sound byte.
This is a 7-segment shield for Arduino NG/Diecimila/Duemilanove and many Freeduino boards.
The Joystick Shield sits on top of your Arduino and turns it into a simple controller. Control man, get some CONTROL! (PCB only - buttons/components not included)
This is a simple to use USB AVR programmer. It is low cost, easy to use, works great with AVRDude, and is tested under Windows, Linux, and MacOS X.
The Ardweeny BackPack - free your Ardweeny from the breadboard, and set it free to the world!
The RED LED Ardweeny BackPack - free your Ardweeny from the breadboard, and set it free to the world!