Florin sent in this link to an interesting stepper motor controller. It uses a single ATmega8 to control all 3 of the motor controllers. Check out the web site for a video, schematics, and sources files for making your own. [Thanks Florin]
Although the motors are controlled by the same microcontroller each one can move independent. The board can receive commands to drive the motors trough serial interface from a computer. There is also a PC software that enables you to send commands from a nice graphical interface.
Read more about making a 3-in-1 Stepper Motor Controller
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UIM stepper motor controllers/drivers
UIrobot featured Stepper Motor Controllers and Stepper Motor Drivers size only 42.3*42.3*13.5mm include parallel port stepper motor driver, serial port (RS232) and network(CAN Protocol) Stepper Motor Controller which can be directly mounted onto size 42/57/86/110mm (They are NEMA17, NEMA23, NEMA34 and NEMA42 step motors) stepper motors. Ultra-miniature size, high performance, standalone workable or as built-in control and drive unit, easy wiring and strong driving force are the unique selling point of UIM stepper motor controllers and stepper motor drivers.