I've hacked the stepper library to use the EasyDriver board from sparkfun.com. I just wanted it to be drop-in compatible w/ the stepper lib so I could take any .pde using the stepper lib, change a couple of #defines and be good to go. Its kind of sloppy there could be probs but it seems to work for me:
EasyDriver.h:
/*
EasyDriver.h - Arduino Library for EasyDriver 3.0 stepper driver board from Sparkfun.com
Based on:
Stepper.h - - Stepper library for Wiring/Arduino - Version 0.4
Original library (0.1) by Tom Igoe.
Two-wire modifications (0.2) by Sebastian Gassner
Combination version (0.3) by Tom Igoe and David Mellis
Bug fix for four-wire (0.4) by Tom Igoe, bug fix from Noah Shibley
I wanted This library to be a simple drop-in replacement for the standard stepper lib.
just change some defines and go!!
Makenb "at" gmail.com 8/28/09
*/
// ensure this library description is only included once
#ifndef EasyDriver_h
#define EasyDriver_h
// library interface description
class Stepper {
public:
// constructors:
Stepper(int number_of_steps, int dir_pin, int step_pin);
// speed setter method:
void setSpeed(long whatSpeed);
// mover method:
void step(int number_of_steps);
int version(void);
private:
void stepMotor(int this_step);
int direction; // Direction of rotation
int speed; // Speed in RPMs
unsigned long step_delay; // delay between steps, in ms, based on speed
int number_of_steps; // total number of steps this motor can take
// int pin_count; // whether you're driving the motor with 2 or 4 pins
int step_number; // which step the motor is on
// motor pin numbers:
int dir_pin;
int step_pin;
long last_step_time; // time stamp in ms of when the last step was taken
};
#endif
EasyDiver.cpp
/*
EasyDiver.cpp - Arduino Library for EasyDriver 3.0 stepper driver board from Sparkfun.com
Based on:
Stepper.cpp - - Stepper library for Wiring/Arduino - Version 0.4
Original library (0.1) by Tom Igoe.
Two-wire modifications (0.2) by Sebastian Gassner
Combination version (0.3) by Tom Igoe and David Mellis
Bug fix for four-wire (0.4) by Tom Igoe, bug fix from Noah Shibley
I wanted This library to be a simple drop-in replacement for the standard stepper lib.
just change some defines and go!!
Maken "at" maken.org 8/28/09
*/
#include "WProgram.h"
#include "EasyDriver.h"
/*
* EasyDriver constructor.
* Sets Direction and Step Pins.
*/
Stepper::Stepper(int number_of_steps, int dir_pin, int step_pin)
{
this->step_number = 0; // which step the motor is on
this->speed = 0; // the motor speed, in revolutions per minute
this->direction = 0; // motor direction
this->last_step_time = 0; // time stamp in ms of the last step taken
this->number_of_steps = number_of_steps; // total number of steps for this motor
// Arduino pins for the motor control connection:
this->dir_pin = dir_pin;
this->step_pin = step_pin;
// setup the pins on the microcontroller:
pinMode(this->dir_pin, OUTPUT);
pinMode(this->step_pin, OUTPUT);
// When there are only 2 pins, set the other two to 0:
//this->motor_pin_3 = 0;
//this->motor_pin_4 = 0;
// pin_count is used by the stepMotor() method:
//this->pin_count = 2;
}
/*
Sets the speed in revs per minute
*/
void Stepper::setSpeed(long whatSpeed)
{
this->step_delay = 60L * 1000L / this->number_of_steps / whatSpeed;
}
/*
Moves the motor steps_to_move steps. If the number is negative,
the motor moves in the reverse direction.
*/
void Stepper::step(int steps_to_move)
{
int steps_left = abs(steps_to_move); // how many steps to take
// determine direction based on whether steps_to_mode is + or -:
if (steps_to_move > 0) {this->direction = 1;}
if (steps_to_move < 0) {this->direction = 0;}
// decrement the number of steps, moving one step each time:
while(steps_left > 0) {
// move only if the appropriate delay has passed:
if (millis() - this->last_step_time >= this->step_delay) {
// get the timeStamp of when you stepped:
this->last_step_time = millis();
// increment or decrement the step number,
// depending on direction:
if (this->direction == 1) {
this->step_number++;
if (this->step_number == this->number_of_steps) {
this->step_number = 0;
}
}
else {
if (this->step_number == 0) {
this->step_number = this->number_of_steps;
}
this->step_number--;
}
// decrement the steps left:
steps_left--;
// step the motor to step number 0, 1, 2, or 3:
stepMotor(this->direction);
}
}
}
/*
* Moves the motor forward or backwards.
*/
void Stepper::stepMotor(int thisDir)
{
digitalWrite(dir_pin, thisDir);
delayMicroseconds(100);
digitalWrite(step_pin, LOW);
delayMicroseconds(100);
digitalWrite(step_pin, HIGH);
delayMicroseconds(100);
}
/*
version() returns the version of the library:
*/
int Stepper::version(void)
{
return .01;
}
Thanks to Tom Igoe and others 
Maken