Adafruit Motor Shield for Arduino Kit
Easy to use and full featured motor driver shield for Arduino.  Made by Adafruit.Comes in kit form, requires soldering.2 connections for 5V 'hobby' servos connected to the Arduino's high-resolution dedicated timer - no jitter!4 H-Bridges: L293D chipset provides 0.6A per bridge (1.2A peak) with thermal shutdown protection, internal kickback protection diodes. Can run motors on 4.5VDC to 36VDC.Up to 4 bi-directional DC motors with individual 8-bit speed selection (so, about 0.5% resolution)Up to 2 stepper motors (unipolar or bipolar) with single coil, double coil or interleaved stepping.Pull down resistors keep motors disabled during power-upBig terminal block connectors to easily hook up wires (18-26AWG) and powerArduino reset button brought up top2-pin terminal block and jumper to connect external power, for separate logic/motor suppliesTested compatible with Arduino Mega 1280 & 2560, Diecimila, Duemilanove, and UNODownload the easy-to-use Arduino software library, check out the examples and you're ready to go!